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selfridge_seq_conjecture

Specification

Selfridge conjectured that the number of prime factors of the `n`-th Fermat number does not grow monotonically in $n$.

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Lean 4 Statement
theorem selfridge_seq_conjecture : ¬ Monotone fermatFactors
ID: Wikipedia__Selfridge__selfridge_seq_conjecture
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Evaluation Results

Recent Submissions

Model Status Goals Left Submitted Lean Snippet Output
GPT-5.3 Codex Agent v8 Partial 1 Feb 25, 2026
intro hmono have hfalse : False := ?_ exact hfalse
View
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    },
    "reasoning_effort": "high",
    "response_trace_count": 12
  },
  "response_trace": [
    {
      "iteration": 1,
      "event": "search_mathlib",
      "query": "fermatFactors",
      "results_count": 0
    },
    {
      "iteration": 2,
      "event": "search_mathlib",
      "query": "selfridge_seq_conjecture",
      "results_count": 0
    },
    {
      "iteration": 3,
      "provider": "openrouter_primary",
      "finish_reason": "tool_calls",
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        },
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      "proof_code": "intro hmono\nhave hfalse : False := ?_\nexact hfalse",
      "compiler_output_preview": "/app/asi_portal/verifier/quick_1772029057_5501.lean:41:63: error: unsolved goals\ncase refine_1\nhmono : Monotone fermatFactors\n\u22a2 False\n'Selfridge.selfridge_seq_conjecture' depends on axioms: [propext, sorryAx, Classical.choice, Quot.sound]\n\n\n",
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          2
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      },
      "lsp_feedback": {
        "diagnostics": [
          {
            "fullRange": {
              "end": {
                "character": 14,
                "line": 43
              },
              "start": {
                "character": 63,
                "line": 40
              }
            },
            "leanTags": [
              1
            ],
            "message": "unsolved goals\ncase refine_1\nhmono : Monotone fermatFactors\n\u22a2 False",
            "range": {
              "end": {
                "character": 0,
                "line": 41
              },
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                "line": 40
              }
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            "source": "Lean 4"
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                "line": 45
              },
              "start": {
                "character": 0,
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              }
            },
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            "range": {
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                "character": 6,
                "line": 45
              },
              "start": {
                "character": 0,
                "line": 45
              }
            },
            "severity": 3,
            "source": "Lean 4"
          }
        ],
        "error_line": 40,
        "error_char": 63,
        "error_msg": "unsolved goals\ncase refine_1\nhmono : Monotone fermatFactors\n\u22a2 False",
        "goal_before_error": null,
        "full_timeline": [
          {
            "line": 41,
            "code": "intro hmono",
            "goal": "```lean\n\u22a2 \u00acMonotone fermatFactors\n```",
            "goal_count": 1,
            "ast_complexity": 37
          },
          {
            "line": 42,
            "code": "have hfalse : False := ?_",
            "goal": "```lean\nhmono : Monotone fermatFactors\n\u22a2 False\n```",
            "goal_count": 1,
            "ast_complexity": 50
          },
          {
            "line": 43,
            "code": "exact hfalse",
            "goal": "```lean\ncase refine_2\nhmono : Monotone fermatFactors\nhfalse : False\n\u22a2 False\n```\n---\n```lean\ncase refine_1\nhmono : Monotone fermatFactors\n\u22a2 False\n```",
            "goal_count": 2,
            "ast_complexity": 148
          }
        ],
        "tactic_count": 3,
        "successful_tactics": 0,
        "first_failure_step": 1,
        "cps": 0.0,
        "cps_peak_step": 0,
        "error_code": "theorem selfridge_seq_conjecture : \u00ac Monotone fermatFactors := by"
      }
    },
    {
      "iteration": 4,
      "event": "search_mathlib",
      "query": "Selfridge",
      "results_count": 0
    },
    {
      "iteration": 5,
      "event": "search_mathlib",
      "query": "fermatNumber primeFactors card",
      "results_count": 0
    },
    {
      "iteration": 6,
      "event": "search_mathlib",
      "query": "Nat.fermatNumber",
      "results_count": 1
    },
    {
      "iteration": 7,
      "event": "search_mathlib",
      "query": "Nat.fermatNumber_zero",
      "results_count": 1
    },
    {
      "iteration": 8,
      "event": "search_mathlib",
      "query": "Nat.primeFactors",
      "results_count": 1
    },
    {
      "iteration": 9,
      "event": "search_mathlib",
      "query": "Nat.primeFactors_prime",
      "results_count": 8
    },
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      "response_id": "gen-1772029104-725uTVU9FqKNIsm4bEbd",
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        }
      ]
    },
    {
      "iteration": 10,
      "event": "compile_proof",
      "provider": "openrouter_primary",
      "status": "failed",
      "goals_remaining": null,
      "timed_out": false,
      "banned_tokens": [],
      "proof_code": "intro hmono\nhave h5 : fermatFactors 5 = 2 := by\n  decide\nhave h4 : fermatFactors 4 = 1 := by\n  decide\nhave hle : fermatFactors 5 \u2264 fermatFactors 4 := by\n  exact hmono (by decide)\nhave : False := by\n  omega\nexact this",
      "compiler_output_preview": "/app/asi_portal/verifier/quick_1772029140_2171.lean:44:4: error: Tactic `decide` failed for proposition\n  fermatFactors 5 = 2\nbecause its `Decidable` instance\n  instDecidableEqNat (fermatFactors 5) 2\ndid not reduce to `isTrue` or `isFalse`.\n\nAfter unfolding the instances `instDecidableEqNat` and `Nat.decEq`, reduction got stuck at the `Decidable` instance\n  match h : (fermatFactors 5).beq 2 with\n  | true => isTrue \u22ef\n  | false => isFalse \u22ef\n/app/asi_portal/verifier/quick_1772029140_2171.lean:46:4:\n...<truncated>",
      "compile_elapsed_s": 30.008,
      "tactic_replay": {
        "tactic_count": 10,
        "successful_tactics": 2,
        "first_failure_step": 3,
        "goal_trajectory": [
          1,
          1,
          1,
          1,
          1,
          1,
          1,
          1,
          1,
          1
        ],
        "max_goals": 1,
        "final_goal_count": 1,
        "goals_opened": 0,
        "goals_closed": 0
      },
      "lsp_feedback": {
        "diagnostics": [
          {
            "fullRange": {
              "end": {
                "character": 10,
                "line": 43
              },
              "start": {
                "character": 4,
                "line": 43
              }
            },
            "message": "Tactic `decide` failed for proposition\n  fermatFactors 5 = 2\nbecause its `Decidable` instance\n  instDecidableEqNat (fermatFactors 5) 2\ndid not reduce to `isTrue` or `isFalse`.\n\nAfter unfolding the instances `instDecidableEqNat` and `Nat.decEq`, reduction got stuck at the `Decidable` instance\n  match h : (fermatFactors 5).beq 2 with\n  | true => isTrue \u22ef\n  | false => isFalse \u22ef",
            "range": {
              "end": {
                "character": 10,
                "line": 43
              },
              "start": {
                "character": 4,
                "line": 43
              }
            },
            "severity": 1,
            "source": "Lean 4"
          },
          {
            "fullRange": {
              "end": {
                "character": 10,
                "line": 45
              },
              "start": {
                "character": 4,
                "line": 45
              }
            },
            "message": "Tactic `decide` failed for proposition\n  fermatFactors 4 = 1\nbecause its `Decidable` instance\n  instDecidableEqNat (fermatFactors 4) 1\ndid not reduce to `isTrue` or `isFalse`.\n\nAfter unfolding the instances `instDecidableEqNat` and `Nat.decEq`, reduction got stuck at the `Decidable` instance\n  match h : (fermatFactors 4).beq 1 with\n  | true => isTrue \u22ef\n  | false => isFalse \u22ef",
            "range": {
              "end": {
                "character": 10,
                "line": 45
              },
              "start": {
                "character": 4,
                "line": 45
              }
            },
            "severity": 1,
            "source": "Lean 4"
          },
          {
            "fullRange": {
              "end": {
                "character": 26,
                "line": 47
              },
              "start": {
                "character": 20,
                "line": 47
              }
            },
            "message": "Tactic `decide` proved that the proposition\n  5 \u2264 4\nis false",
            "range": {
              "end": {
                "character": 26,
                "line": 47
              },
              "start": {
                "character": 20,
                "line": 47
              }
            },
            "severity": 1,
            "source": "Lean 4"
          },
          {
            "fullRange": {
              "end": {
                "character": 6,
                "line": 52
              },
              "start": {
                "character": 0,
                "line": 52
              }
            },
            "message": "'Selfridge.selfridge_seq_conjecture' depends on axioms: [propext, sorryAx, Classical.choice, Quot.sound]",
            "range": {
              "end": {
                "character": 6,
                "line": 52
              },
              "start": {
                "character": 0,
                "line": 52
              }
            },
            "severity": 3,
            "source": "Lean 4"
          }
        ],
        "error_line": 43,
        "error_char": 4,
        "error_msg": "Tactic `decide` failed for proposition\n  fermatFactors 5 = 2\nbecause its `Decidable` instance\n  instDecidableEqNat (fermatFactors 5) 2\ndid not reduce to `isTrue` or `isFalse`.\n\nAfter unfolding the instances `instDecidableEqNat` and `Nat.decEq`, reduction got stuck at the `Decidable` instance\n  match h : (fermatFactors 5).beq 2 with\n  | true => isTrue \u22ef\n  | false => isFalse \u22ef",
        "goal_before_error": "```lean\nhmono : Monotone fermatFactors\n\u22a2 fermatFactors 5 = 2\n```",
        "full_timeline": [
          {
            "line": 41,
            "code": "intro hmono",
            "goal": "```lean\n\u22a2 \u00acMonotone fermatFactors\n```",
            "goal_count": 1,
            "ast_complexity": 37
          },
          {
            "line": 42,
            "code": "have h5 : fermatFactors 5 = 2 := by",
            "goal": "```lean\nhmono : Monotone fermatFactors\n\u22a2 False\n```",
            "goal_count": 1,
            "ast_complexity": 50
          },
          {
            "line": 43,
            "code": "decide",
            "goal": "```lean\nhmono : Monotone fermatFactors\n\u22a2 fermatFactors 5 = 2\n```",
            "goal_count": 1,
            "ast_complexity": 64
          },
          {
            "line": 44,
            "code": "have h4 : fermatFactors 4 = 1 := by",
            "goal": "```lean\nhmono : Monotone fermatFactors\nh5 : fermatFactors 5 = 2\n\u22a2 False\n```",
            "goal_count": 1,
            "ast_complexity": 75
          },
          {
            "line": 45,
            "code": "decide",
            "goal": "```lean\nhmono : Monotone fermatFactors\nh5 : fermatFactors 5 = 2\n\u22a2 fermatFactors 4 = 1\n```",
            "goal_count": 1,
            "ast_complexity": 89
          },
          {
            "line": 46,
            "code": "have hle : fermatFactors 5 \u2264 fermatFactors 4 := by",
            "goal": "```lean\nhmono : Monotone fermatFactors\nh5 : fermatFactors 5 = 2\nh4 : fermatFactors 4 = 1\n\u22a2 False\n```",
            "goal_count": 1,
            "ast_complexity": 100
          },
          {
            "line": 47,
            "code": "exact hmono (by decide)",
            "goal": "```lean\nhmono : Monotone fermatFactors\nh5 : fermatFactors 5 = 2\nh4 : fermatFactors 4 = 1\n\u22a2 fermatFactors 5 \u2264 fermatFactors 4\n```",
            "goal_count": 1,
            "ast_complexity": 128
          },
          {
            "line": 48,
            "code": "have : False := by",
            "goal": "```lean\nhmono : Monotone fermatFactors\nh5 : fermatFactors 5 = 2\nh4 : fermatFactors 4 = 1\nhle : fermatFactors 5 \u2264 fermatFactors 4\n\u22a2 False\n```",
            "goal_count": 1,
            "ast_complexity": 140
          },
          {
            "line": 49,
            "code": "omega",
            "goal": "```lean\nhmono : Monotone fermatFactors\nh5 : fermatFactors 5 = 2\nh4 : fermatFactors 4 = 1\nhle : fermatFactors 5 \u2264 fermatFactors 4\n\u22a2 False\n```",
            "goal_count": 1,
            "ast_complexity": 140
          },
          {
            "line": 50,
            "code": "exact this",
            "goal": "```lean\nhmono : Monotone fermatFactors\nh5 : fermatFactors 5 = 2\nh4 : fermatFactors 4 = 1\nhle : fermatFactors 5 \u2264 fermatFactors 4\nthis : False\n\u22a2 False\n```",
            "goal_count": 1,
            "ast_complexity": 153
          }
        ],
        "tactic_count": 10,
        "successful_tactics": 2,
        "first_failure_step": 3,
        "cps": 20.0,
        "cps_peak_step": 2,
        "error_code": "decide"
      }
    }
  ],
  "verification": {
    "banned_tokens": [],
    "command": [
      "[path]
      "lean",
      "/app/asi_portal/verifier/quick_1772029170_7689.lean"
    ],
    "comparator_passed": null,
    "duration_s": 15.921748876571655,
    "goals_remaining": 1,
    "is_verified": false,
    "lean_file_path": "",
    "problem": {
      "axioms_check_name": "selfridge_seq_conjecture",
      "axioms_check_skipped": false,
      "benchmark_id": "Wikipedia__Selfridge__selfridge_seq_conjecture",
      "category": "research_open",
      "endings": [
        "end FermatNumbers",
        "end Selfridge"
      ],
      "imports": [
        "FormalConjectures.Util.ProblemImports"
      ],
      "preamble_chars": 805,
      "source_file": "FormalConjectures/Wikipedia/Selfridge.lean",
      "title": "selfridge_seq_conjecture"
    },
    "returncode": 1,
    "status": "partial",
    "stderr": "",
    "stdout": "/app/asi_portal/verifier/quick_1772029170_7689.lean:41:63: error: unsolved goals\ncase refine_1\nhmono : Monotone fermatFactors\n\u22a2 False\n'Selfridge.selfridge_seq_conjecture' depends on axioms: [propext, sorryAx, Classical.choice, Quot.sound]\n\n",
    "timed_out": false
  },
  "phase2_error": "ProgressAnalysisResult.__init__() missing 1 required positional argument: 'progress_score'"
}
Gemini 3.1 Pro Agent v8 Failed -- Feb 24, 2026
View
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    "best_status": "pending",
    "best_goals": null,
    "max_iterations": 10,
    "model": "google/gemini-3.1-pro-preview",
    "error": "OpenRouter API error 402: {\"error\":{\"message\":\"This request requires more credits, or fewer max_tokens. You requested up to 65536 tokens, but can only afford 58661. To increase, visit https://openrouter.ai/settings/keys and create a key with a higher total limit\",\"code\":402,\"metadata\":{\"provider_name\":null}},\"user_id\":\"user_2zsm3L1zzBL2yxyrvmrXwgeTimc\"}",
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    "reasoning_effort": "high",
    "response_trace_count": 0
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  "response_trace": []
}
Gemini 3 Flash Agent v8 Partial 1 Feb 17, 2026
intro h unfold Monotone at h obtain ⟨n, m, hle, hlt⟩ : ∃ n m, n ≤ m ∧ fermatFactors m < fermatFactors n := by use 33, 34 constructor · linarith · refine ?_ exact (h hle).not_gt hlt
View
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    "model": "gemini-3-flash-preview",
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  },
  "response_trace": [
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    },
    {
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      "provider": "openrouter_primary",
      "status": "failed",
      "goals_remaining": null,
      "timed_out": false,
      "banned_tokens": [],
      "proof_code": "intro h\nunfold Monotone at h\nlet f0 := fermatFactors 0\nlet f1 := fermatFactors 1\nlet f2 := fermatFactors 2\nlet f3 := fermatFactors 3\nlet f4 := fermatFactors 4\nlet f5 := fermatFactors 5\nlet f6 := fermatFactors 11\nhave h0 : fermatFactors 0 = 1 := by\n  unfold fermatFactors\n  simp [Nat.fermatNumber]\nhave h1 : fermatFactors 1 = 1 := by\n  unfold fermatFactors\n  simp [Nat.fermatNumber]\nhave h2 : fermatFactors 2 = 1 := by\n  unfold fermatFactors\n  simp [Nat.fermatNumber]\nhave h3 : fermatFactors 3 = 1 := by\n  unfold fermatFactors\n  simp [Nat.fermatNumber]\nhave h4 : fermatFactors 4 = 1 := by\n  unfold fermatFactors\n  simp [Nat.fermatNumber]\nhave h5 : fermatFactors 5 = 2 := by\n  unfold fermatFactors\n  refine ?_\nhave h6 : fermatFactors 11 > fermatFactors 12 := by\n  refine ?_\napply h6\nrefine h ?_\nlinarith",
      "compiler_output_preview": "[path]:66:35: error: unsolved goals\nh : \u2200 \u2983a b : \u2115\u2984, a \u2264 b \u2192 fermatFactors a \u2264 fermatFactors b\nf0 : \u2115 := fermatFactors 0\nf1 : \u2115 := fermatFactors 1\nf2 : \u2115 := fermatFactors 2\nf3 : \u2115 := fermatFactors 3\nf4 : \u2115 := fermatFactors 4\nf5 : \u2115 := fermatFactors 5\nf6 : \u2115 := fermatFactors 11\nh0 : fermatFactors 0 = 1\nh1 : fermatFactors 1 = 1\nh2 : fermatFactors 2 = 1\nh3 : fermatFactors 3 = 1\nh4 \n...<truncated>"
    },
    {
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      "response_id": "gen-1771350144-IqRRC4Ck3QssR1fuXTOP",
      "api_elapsed_s": 1.647,
      "usage": {
        "prompt_tokens": 3089,
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      },
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    },
    {
      "iteration": 2,
      "event": "compile_proof",
      "provider": "openrouter_primary",
      "status": "failed",
      "goals_remaining": null,
      "timed_out": false,
      "banned_tokens": [],
      "proof_code": "intro h\nunfold Monotone at h\nobtain \u27e8n, m, hle, hlt\u27e9 : \u2203 n m, n \u2264 m \u2227 fermatFactors m < fermatFactors n := by\n  refine \u27e833, 34, ?_, ?_\u27e9\n  \u00b7 linarith\n  \u00b7 refine ?_\nexact (h hle).not_lt hlt",
      "compiler_output_preview": "[path]:47:4: error: unsolved goals\ncase refine_2\nh : \u2200 \u2983a b : \u2115\u2984, a \u2264 b \u2192 fermatFactors a \u2264 fermatFactors b\n\u22a2 fermatFactors 34 < fermatFactors 33\n[path]:48:8: error: `LE.le.not_lt` has been deprecated: use `LE.le.not_gt` instead\n'Selfridge.selfridge_seq_conjectu\n...<truncated>"
    },
    {
      "iteration": 3,
      "provider": "openrouter_primary",
      "finish_reason": "stop",
      "response_id": "gen-1771350153-lDcRIbBoGaWOadcCEYVj",
      "api_elapsed_s": 1.476,
      "usage": {
        "prompt_tokens": 3440,
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        "total_tokens": 3522,
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      },
      "openrouter_retries": 0,
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    },
    {
      "iteration": 3,
      "event": "compile_proof",
      "provider": "openrouter_primary",
      "status": "failed",
      "goals_remaining": null,
      "timed_out": false,
      "banned_tokens": [],
      "proof_code": "intro h\nunfold Monotone at h\nobtain \u27e8n, m, hle, hlt\u27e9 : \u2203 n m, n \u2264 m \u2227 fermatFactors m < fermatFactors n := by\n  use 33, 34\n  constructor\n  \u00b7 linarith\n  \u00b7 refine ?_\nexact (h hle).not_lt hlt",
      "compiler_output_preview": "[path]:48:4: error: unsolved goals\ncase h.right\nh : \u2200 \u2983a b : \u2115\u2984, a \u2264 b \u2192 fermatFactors a \u2264 fermatFactors b\n\u22a2 fermatFactors 34 < fermatFactors 33\n[path]:49:8: error: `LE.le.not_lt` has been deprecated: use `LE.le.not_gt` instead\n'Selfridge.selfridge_seq_conjectur\n...<truncated>"
    },
    {
      "iteration": 4,
      "provider": "openrouter_primary",
      "finish_reason": "stop",
      "response_id": "gen-1771350162-IAxsyGFkVo3aEVVEbwuA",
      "api_elapsed_s": 1.608,
      "usage": {
        "prompt_tokens": 3786,
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        "total_tokens": 3868,
        "reasoning_tokens": null,
        "cost_usd": 0.002139
      },
      "openrouter_retries": 0,
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    },
    {
      "iteration": 4,
      "event": "compile_proof",
      "provider": "openrouter_primary",
      "status": "partial",
      "goals_remaining": 1,
      "timed_out": false,
      "banned_tokens": [],
      "proof_code": "intro h\nunfold Monotone at h\nobtain \u27e8n, m, hle, hlt\u27e9 : \u2203 n m, n \u2264 m \u2227 fermatFactors m < fermatFactors n := by\n  use 33, 34\n  constructor\n  \u00b7 linarith\n  \u00b7 refine ?_\nexact (h hle).not_gt hlt",
      "compiler_output_preview": "[path]:48:4: error: unsolved goals\ncase h.right\nh : \u2200 \u2983a b : \u2115\u2984, a \u2264 b \u2192 fermatFactors a \u2264 fermatFactors b\n\u22a2 fermatFactors 34 < fermatFactors 33\n'Selfridge.selfridge_seq_conjecture' depends on axioms: [propext, sorryAx, Classical.choice, Quot.sound]\n\n"
    },
    {
      "iteration": 5,
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        "cost_usd": 0.00139775
      },
      "openrouter_retries": 0,
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    },
    {
      "iteration": 5,
      "event": "compile_proof",
      "provider": "openrouter_primary",
      "status": "partial",
      "goals_remaining": 1,
      "timed_out": false,
      "banned_tokens": [],
      "proof_code": "intro h\nunfold Monotone at h\nobtain \u27e8n, m, hle, hlt\u27e9 : \u2203 n m, n \u2264 m \u2227 fermatFactors m < fermatFactors n := by\n  use 33, 34\n  constructor\n  \u00b7 linarith\n  \u00b7 unfold fermatFactors\n    refine ?_\nexact (h hle).not_gt hlt",
      "compiler_output_preview": "[path]:48:4: error: unsolved goals\ncase h.right\nh : \u2200 \u2983a b : \u2115\u2984, a \u2264 b \u2192 fermatFactors a \u2264 fermatFactors b\n\u22a2 (Nat.fermatNumber 34).primeFactors.card < (Nat.fermatNumber 33).primeFactors.card\n'Selfridge.selfridge_seq_conjecture' depends on axioms: [propext, sorryAx, Classical.choice, Quot.sound]\n\n"
    },
    {
      "iteration": 6,
      "provider": "openrouter_primary",
      "finish_reason": "stop",
      "response_id": "gen-1771350180-7wcrqpFiVTErDAgyqSxN",
      "api_elapsed_s": 1.437,
      "usage": {
        "prompt_tokens": 4387,
        "completion_tokens": 89,
        "total_tokens": 4476,
        "reasoning_tokens": null,
        "cost_usd": 0.0024605
      },
      "openrouter_retries": 0,
      "response_text_len": 213
    },
    {
      "iteration": 6,
      "event": "compile_proof",
      "provider": "openrouter_primary",
      "status": "partial",
      "goals_remaining": 1,
      "timed_out": false,
      "banned_tokens": [],
      "proof_code": "intro h\nunfold Monotone at h\nobtain \u27e8n, m, hle, hlt\u27e9 : \u2203 n m, n \u2264 m \u2227 fermatFactors m < fermatFactors n := by\n  use 33, 34\n  constructor\n  \u00b7 linarith\n  \u00b7 unfold fermatFactors\n    refine ?_\napply (h hle).not_gt hlt",
      "compiler_output_preview": "[path]:48:4: error: unsolved goals\ncase h.right\nh : \u2200 \u2983a b : \u2115\u2984, a \u2264 b \u2192 fermatFactors a \u2264 fermatFactors b\n\u22a2 (Nat.fermatNumber 34).primeFactors.card < (Nat.fermatNumber 33).primeFactors.card\n'Selfridge.selfridge_seq_conjecture' depends on axioms: [propext, sorryAx, Classical.choice, Quot.sound]\n\n"
    },
    {
      "iteration": 7,
      "provider": "openrouter_primary",
      "finish_reason": "stop",
      "response_id": "gen-1771350188-QQ6m9uSYMFxhQXJWnJkO",
      "api_elapsed_s": 1.576,
      "usage": {
        "prompt_tokens": 4699,
        "completion_tokens": 107,
        "total_tokens": 4806,
        "reasoning_tokens": null,
        "cost_usd": 0.00085925
      },
      "openrouter_retries": 0,
      "response_text_len": 253
    },
    {
      "iteration": 7,
      "event": "compile_proof",
      "provider": "openrouter_primary",
      "status": "failed",
      "goals_remaining": null,
      "timed_out": false,
      "banned_tokens": [],
      "proof_code": "intro h\nreplace h := h (by linarith : 33 \u2264 34)\nunfold fermatFactors at h\nobtain \u27e8n, m, hle, hlt\u27e9 : \u2203 n m, n \u2264 m \u2227 fermatFactors m < fermatFactors n := by\n  use 33, 34\n  constructor\n  \u00b7 linarith\n  \u00b7 unfold fermatFactors\n    refine ?_\nexact (h).not_gt hlt",
      "compiler_output_preview": "[path]:49:4: error: unsolved goals\ncase h.right\nh : (Nat.fermatNumber 33).primeFactors.card \u2264 (Nat.fermatNumber 34).primeFactors.card\n\u22a2 (Nat.fermatNumber 34).primeFactors.card < (Nat.fermatNumber 33).primeFactors.card\n[path]:51:19: error: exponent 17179869183 ex\n...<truncated>"
    },
    {
      "iteration": 8,
      "provider": "openrouter_primary",
      "finish_reason": "stop",
      "response_id": "gen-1771350197-6B1PGBlxom6tCaqFpOMh",
      "api_elapsed_s": 1.629,
      "usage": {
        "prompt_tokens": 5226,
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        "total_tokens": 5307,
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        "cost_usd": 0.0010443
      },
      "openrouter_retries": 0,
      "response_text_len": 197
    },
    {
      "iteration": 8,
      "event": "compile_proof",
      "provider": "openrouter_primary",
      "status": "failed",
      "goals_remaining": null,
      "timed_out": false,
      "banned_tokens": [],
      "proof_code": "intro h\nunfold Monotone at h\nlet m := 33\nlet n := 34\nhave h_le : m \u2264 n := by linarith\nhave h_f : fermatFactors n < fermatFactors m := by\n  unfold fermatFactors\n  refine ?_\nexact (h h_le).not_gt h_f",
      "compiler_output_preview": "[path]:46:26: error: linarith failed to find a contradiction\ncase h\nh : \u2200 \u2983a b : \u2115\u2984, a \u2264 b \u2192 fermatFactors a \u2264 fermatFactors b\nm : \u2115 := 33\nn : \u2115 := 34\na\u271d : n < m\n\u22a2 False\nfailed\n[path]:47:50: error: unsolved goals\nh : \u2200 \u2983a b : \u2115\u2984, a \u2264 b \u2192 fermatFactors a \u2264 fermat\n...<truncated>"
    }
  ],
  "verification": {
    "banned_tokens": [],
    "command": [
      "[path]
      "lean",
      "[path]
    ],
    "duration_s": 7.389786005020142,
    "goals_remaining": 1,
    "is_verified": false,
    "lean_file_path": "[path]
    "problem": {
      "axioms_check_name": "selfridge_seq_conjecture",
      "axioms_check_skipped": false,
      "benchmark_id": "Wikipedia__Selfridge__selfridge_seq_conjecture",
      "category": "research_open",
      "endings": [
        "end FermatNumbers",
        "end Selfridge"
      ],
      "imports": [
        "FormalConjectures.Util.ProblemImports"
      ],
      "preamble_chars": 805,
      "source_file": "FormalConjectures/Wikipedia/Selfridge.lean",
      "title": "selfridge_seq_conjecture"
    },
    "returncode": 1,
    "status": "partial",
    "stderr": "",
    "stdout": "[path]:48:4: error: unsolved goals\ncase h.right\nh : \u2200 \u2983a b : \u2115\u2984, a \u2264 b \u2192 fermatFactors a \u2264 fermatFactors b\n\u22a2 fermatFactors 34 < fermatFactors 33\n'Selfridge.selfridge_seq_conjecture' depends on axioms: [propext, sorryAx, Classical.choice, Quot.sound]\n",
    "timed_out": false
  }
}
Gemini 3 Flash Preview Failed -- Feb 14, 2026
simp [Nat.fermatNumber] norm_num decide have h5 : (Nat.fermatNumber 5).primeFactors.card = 2 := by simp [Nat.fermatNumber] norm_num decide rw [h4, h5] norm_num -- The above logic shows it is non-decreasing for 4 and 5. -- Since the conjecture is that it is NOT monotone, and the sequence is known to be non-decreasing for small n, -- the counterexample must occur at much larger n where the number of factors drops. -- However, since I cannot compute large Fermat factors, I will provide a structure that attempts to find a contradiction. by_contra h have h_inc : fermatFactors 11 < fermatFactors 10 := by -- This is a placeholder for the actual counterexample if it were known. -- In a real proof, one would provide the specific n, m. simp [fermatFactors] decide exact (h (show 10 ≤ 11 by norm_num)).not_lt h_inc
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