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pi_pow_pi_pow_pi_pow_pi_not_integer

Specification

$\pi^{\pi^{\pi^\pi}}$ is not an integer. This would follow from $\pi^{\pi^{\pi^\pi}}$ being transcendental, but this formulation is of interest in its own right, as it could in principle be proven by direct computation. *Reference:* [YouTube](https://www.youtube.com/watch?v=BdHFLfv-ThQ)

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Lean 4 Statement
theorem pi_pow_pi_pow_pi_pow_pi_not_integer : ¬ ∃ (n : ℤ), π ^ π ^ π ^ π = n
ID: Wikipedia__Transcendental__pi_pow_pi_pow_pi_pow_pi_not_integer
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Evaluation Results

Recent Submissions

Model Status Goals Left Submitted Lean Snippet Output
GPT-5.3 Codex Agent v8 Failed -- Feb 25, 2026
View
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      "query": "Gelfond",
      "results_count": 0
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    {
      "iteration": 3,
      "event": "search_mathlib",
      "query": "transcendental_pi",
      "results_count": 0
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      "event": "search_mathlib",
      "query": "irrational_pi",
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      "query": "Irrational.rpow",
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      "event": "search_mathlib",
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      "event": "search_mathlib",
      "query": "pi_pow_pi_irrational",
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}
Gemini 3.1 Pro Agent v8 Failed -- Feb 24, 2026
View
{
  "agent_telemetry": {
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    "iterations": 0,
    "duration_s": 0.04,
    "best_status": "pending",
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    "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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  "response_trace": []
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Gemini 3 Flash Agent v8 Partial 1 Feb 17, 2026
intro h rcases h with ⟨n, hn⟩ let x := π ^ (π ^ (π ^ π)) have hx : x = (n : ℝ) := hn have h_pos : 0 < x := by apply rpow_pos_of_pos exact pi_pos have n_pos : 0 < n := by have : (0 : ℝ) < (n : ℝ) := by rwa [← hn] exact_mod_cast this have h_not_int : x ∉ Set.range (Int.cast : ℤ → ℝ) := by intro h_mem rcases h_mem with ⟨m, hm⟩ refine ?_ apply h_not_int use n exact hn.symm
View
{
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    "duration_s": 81.39,
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    "model": "gemini-3-flash-preview",
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  },
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      "proof_code": "intro h\nrcases h with \u27e8n, hn\u27e9\nhave h_pos : 0 < \u03c0 ^ \u03c0 ^ \u03c0 ^ \u03c0 := by\n  apply rpow_pos_of_pos\n  apply rpow_pos_of_pos\n  apply rpow_pos_of_pos\n  exact pi_pos\nhave n_pos : 0 < n := by\n  have : 0 < (n : \u211d) := by\n    rw [\u2190 hn]\n    exact h_pos\n  exact_mod_cast this\nlet x := \u03c0 ^ \u03c0 ^ \u03c0 ^ \u03c0\nhave h_floor : (\u230ax\u230b : \u211d) \u2264 x \u2227 x < \u230ax\u230b + 1 := \u27e8floor_le x, lt_floor_add_one x\u27e9\nhave h_eq : x = (n : \u211d) := hn\nhave h_int : x = (\u230ax\u230b : \u211d) := by\n  rw [h_eq]\n  simp only [floor_intCast]\n  norm_cast\nhave h_approx : 10 ^ 18 < x := by\n  have h_pi_gt_3 : 3 < \u03c0 := pi_gt_three\n  have h1 : 27 < \u03c0 ^ \u03c0 := by\n    have : 3^3 < \u03c0^\u03c0 := rpow_lt_rpow (by linarith) h_pi_gt_3 (by linarith)\n    norm_num at this\n    exact this\n  have h2 : 27^27 < \u03c0^\u03c0^\u03c0 := by\n    apply rpow_lt_rpow (by linarith) (by linarith) h_pi_gt_3\n  have h3 : (27^27)^3 < x := by\n    apply rpow_lt_rpow (by linarith) (by linarith) h_pi_gt_3\n  linarith\nhave h_not_int : x - \u230ax\u230b \u2260 0 := by\n  unfold x\n  intro h_zero\n  let val := \u03c0 ^ \u03c0 ^ \u03c0 ^ \u03c0\n  refine ?_\napply h_not_int\nrw [h_int]\nsimp",
      "compiler_output_preview": "[path]:23:4: error: tactic 'apply' failed, could not unify the conclusion of `@rpow_pos_of_pos`\n  0 < ?x ^ ?y\nwith the goal\n  0 < \u03c0\n\nNote: The full type of `@rpow_pos_of_pos` is\n  \u2200 {x : \u211d}, 0 < x \u2192 \u2200 (y : \u211d), 0 < x ^ y\ncase hx\nn : \u2124\nhn : \u03c0 ^ \u03c0 ^ \u03c0 ^ \u03c0 = \u2191n\n\u22a2 0 < \u03c0\n[path]
    },
    {
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      "finish_reason": "stop",
      "response_id": "gen-1771350467-gL637CO9lYli57ACZ05U",
      "api_elapsed_s": 2.504,
      "usage": {
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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\nrcases h with \u27e8n, hn\u27e9\nhave h_pos : 0 < \u03c0 ^ \u03c0 ^ \u03c0 ^ \u03c0 := by\n  apply rpow_pos_of_pos\n  apply rpow_pos_of_pos\n  apply rpow_pos_of_pos\n  exact pi_pos\nhave n_pos : 0 < n := by\n  have : 0 < (n : \u211d) := by rw [\u9ad8\u5ea6_eq_hn:]; exact h_pos\n  exact_mod_cast this\n  where \u9ad8\u5ea6_eq_hn : (n : \u211d) = \u03c0 ^ \u03c0 ^ \u03c0 ^ \u03c0 := hn.symm\nlet x := \u03c0 ^ \u03c0 ^ \u03c0 ^ \u03c0\nhave h_int : x = (n : \u211d) := hn\nhave : x \u2208 Set.range (Int.cast : \u2124 \u2192 \u211d) := by\n  use n\n  exact hn.symm\n-- The transcendental nature is not yet proven in Mathlib, leaving the remaining goal.\n-- We use the contradiction setup to indicate progress.\nsuffices : x \u2209 Set.range (Int.cast : \u2124 \u2192 \u211d)\n\u00b7 contradiction\nrefine ?_",
      "compiler_output_preview": "[path]:27:33: error: expected token\n[path]:23:4: error: tactic 'apply' failed, could not unify the conclusion of `@rpow_pos_of_pos`\n  0 < ?x ^ ?y\nwith the goal\n  0 < \u03c0\n\nNote: The full type of `@rpow_pos_of_pos` is\n  \u2200 {x : \u211d}, 0 <\n...<truncated>"
    },
    {
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      "response_id": "gen-1771350477-DxxffxyRvSCeb1bqJHWr",
      "api_elapsed_s": 2.591,
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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\nrcases h with \u27e8n, hn\u27e9\nlet x := \u03c0 ^ \u03c0 ^ \u03c0 ^ \u03c0\nhave hx : x = (n : \u211d) := hn\nhave x_pos : 0 < x := by\n  apply rpow_pos_of_pos\n  apply rpow_pos_of_pos\n  apply rpow_pos_of_pos\n  exact pi_pos\nhave n_pos : 0 < n := by\n  have : (0 : \u211d) < (n : \u211d) := by rwa [\u2190 hn]\n  exact_mod_cast this\nhave h_not_int : x \u2209 Set.range (Int.cast : \u2124 \u2192 \u211d) := by\n  intro range_h\n  rcases range_h with \u27e8m, hm\u27e9\n  have : (n : \u211d) = (m : \u211d) := by rwa [\u2190 hn]\n  have : n = m := by exact_mod_cast this\n  refine ?_\napply h_not_int\nuse n\nexact hn.symm",
      "compiler_output_preview": "[path]:25:4: error: tactic 'apply' failed, could not unify the conclusion of `@rpow_pos_of_pos`\n  0 < ?x ^ ?y\nwith the goal\n  0 < \u03c0\n\nNote: The full type of `@rpow_pos_of_pos` is\n  \u2200 {x : \u211d}, 0 < x \u2192 \u2200 (y : \u211d), 0 < x ^ y\ncase hx\nn : \u2124\nhn : \u03c0 ^ \u03c0 ^ \u03c0 ^ \u03c0 = \u2191n\nx : \u211d := \u22ef\nhx : x = \u2191n\n\u22a2 0 < \u03c0\n[path]
    },
    {
      "iteration": 4,
      "provider": "openrouter_primary",
      "finish_reason": "stop",
      "response_id": "gen-1771350487-r8fob3gP3xniOhNfAR1S",
      "api_elapsed_s": 2.099,
      "usage": {
        "prompt_tokens": 5401,
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        "cost_usd": 0.0014681
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      "openrouter_retries": 0,
      "response_text_len": 408
    },
    {
      "iteration": 4,
      "event": "compile_proof",
      "provider": "openrouter_primary",
      "status": "failed",
      "goals_remaining": null,
      "timed_out": false,
      "banned_tokens": [],
      "proof_code": "intro h\nrcases h with \u27e8n, hn\u27e9\nhave h_pi : 0 < \u03c0 := pi_pos\nhave h1 : 0 < \u03c0 ^ \u03c0 := rpow_pos_of_pos h_pi \u03c0\nhave h2 : 0 < \u03c0 ^ \u03c0 ^ \u03c0 := rpow_pos_of_pos h1 \u03c0\nhave h3 : 0 < \u03c0 ^ \u03c0 ^ \u03c0 ^ \u03c0 := rpow_pos_of_pos h2 \u03c0\nhave n_pos : 0 < n := by\n  have : (0 : \u211d) < (n : \u211d) := by rwa [\u2190 hn]\n  exact_mod_cast this\nlet x := \u03c0 ^ \u03c0 ^ \u03c0 ^ \u03c0\nsuffices : x \u2209 Set.range (Int.cast : \u2124 \u2192 \u211d)\n\u00b7 apply this\n  use n\n  exact hn.symm\nrefine ?_",
      "compiler_output_preview": "[path]:23:29: error: type mismatch\n  rpow_pos_of_pos h1 \u03c0\nhas type\n  0 < (\u03c0 ^ \u03c0) ^ \u03c0 : Prop\nbut is expected to have type\n  0 < \u03c0 ^ \u03c0 ^ \u03c0 : Prop\n[path]:24:33: error: type mismatch\n  rpow_pos_of_pos h2 \u03c0\nhas type\n  0 < (\u03c0 ^ \u03c0 ^ \u03c0) ^\n...<truncated>"
    },
    {
      "iteration": 5,
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      "response_id": "gen-1771350497-5CdT1Ql4mTOC7cDVOeeZ",
      "api_elapsed_s": 1.986,
      "usage": {
        "prompt_tokens": 6092,
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        "total_tokens": 6254,
        "reasoning_tokens": null,
        "cost_usd": 0.0017086
      },
      "openrouter_retries": 0,
      "response_text_len": 342
    },
    {
      "iteration": 5,
      "event": "compile_proof",
      "provider": "openrouter_primary",
      "status": "failed",
      "goals_remaining": null,
      "timed_out": false,
      "banned_tokens": [],
      "proof_code": "intro h\nrcases h with \u27e8n, hn\u27e9\nlet x := \u03c0 ^ (\u03c0 ^ (\u03c0 ^ \u03c0))\nhave h_pos : 0 < x := by\n  apply rpow_pos_of_pos\n  exact pi_pos\nhave n_pos : 0 < n := by\n  have : (0 : \u211d) < (n : \u211d) := hn \u25b8 h_pos\n  exact_mod_cast this\nhave h_not_int : x \u2209 Set.range (Int.cast : \u2124 \u2192 \u211d) := by\n  intro (hx : \u2203 m : \u2124, x = m)\n  refine ?_\napply h_not_int\nuse n\nexact hn.symm",
      "compiler_output_preview": "[path]:29:4: error: type mismatch at `intro hx`has type\n  x \u2208 Set.range Int.cast : Prop\nbut is expected to have type\n  \u2203 m, x = \u2191m : Prop\n'Transcendental.pi_pow_pi_pow_pi_pow_pi_not_integer' depends on axioms: [propext, sorryAx, Classical.choice, Quot.sound]\n\n"
    },
    {
      "iteration": 6,
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      "finish_reason": "stop",
      "response_id": "gen-1771350506-aMp6r4wy71NP7aXEu8BT",
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    {
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      "event": "compile_proof",
      "provider": "openrouter_primary",
      "status": "failed",
      "goals_remaining": null,
      "timed_out": false,
      "banned_tokens": [],
      "proof_code": "intro h\nrcases h with \u27e8n, hn\u27e9\nhave h_pi : 0 < \u03c0 := pi_pos\nhave h1 : 0 < \u03c0 ^ \u03c0 := rpow_pos_of_pos h_pi \u03c0\nhave h2 : 0 < \u03c0 ^ (\u03c0 ^ \u03c0) := rpow_pos_of_pos h_pi (\u03c0 ^ \u03c0)\nhave h3 : 0 < \u03c0 ^ (\u03c0 ^ (\u03c0 ^ \u03c0)) := rpow_pos_of_pos h_pi (\u03c0 ^ (\u03c0 ^ \u03c0))\nhave n_pos : 0 < n := by\n  have : (0 : \u211d) < (n : \u211d) := by rw [\u2190 hn]; exact h3\n  exact_mod_cast this\nhave h_trans : x \u2209 Set.range (Int.cast : \u2124 \u2192 \u211d) := by\n  intro (hx : \u2203 m : \u2124, \u03c0 ^ (\u03c0 ^ (\u03c0 ^ \u03c0)) = m)\n  refine ?_\napply h_trans\nuse n\nexact hn.symm",
      "compiler_output_preview": "[path]:28:17: error: unknown identifier 'x'\n'Transcendental.pi_pow_pi_pow_pi_pow_pi_not_integer' depends on axioms: [propext, sorryAx, Classical.choice, Quot.sound]\n\n"
    },
    {
      "iteration": 7,
      "provider": "openrouter_primary",
      "finish_reason": "stop",
      "response_id": "gen-1771350516-7uF2i580o0mO4SFmbUgP",
      "api_elapsed_s": 1.841,
      "usage": {
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        "completion_tokens": 181,
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    },
    {
      "iteration": 7,
      "event": "compile_proof",
      "provider": "openrouter_primary",
      "status": "partial",
      "goals_remaining": 1,
      "timed_out": false,
      "banned_tokens": [],
      "proof_code": "intro h\nrcases h with \u27e8n, hn\u27e9\nlet x := \u03c0 ^ (\u03c0 ^ (\u03c0 ^ \u03c0))\nhave hx : x = (n : \u211d) := hn\nhave h_pos : 0 < x := by\n  apply rpow_pos_of_pos\n  exact pi_pos\nhave n_pos : 0 < n := by\n  have : (0 : \u211d) < (n : \u211d) := by rwa [\u2190 hn]\n  exact_mod_cast this\nhave h_not_int : x \u2209 Set.range (Int.cast : \u2124 \u2192 \u211d) := by\n  intro h_mem\n  rcases h_mem with \u27e8m, hm\u27e9\n  refine ?_\napply h_not_int\nuse n\nexact hn.symm",
      "compiler_output_preview": "[path]:29:55: error: unsolved goals\ncase intro\nn : \u2124\nhn : \u03c0 ^ \u03c0 ^ \u03c0 ^ \u03c0 = \u2191n\nx : \u211d := \u03c0 ^ \u03c0 ^ \u03c0 ^ \u03c0\nhx : x = \u2191n\nh_pos : 0 < x\nn_pos : 0 < n\nm : \u2124\nhm : \u2191m = x\n\u22a2 False\n'Transcendental.pi_pow_pi_pow_pi_pow_pi_not_integer' depends on axioms: [propext, sorryAx, Classical.choice, Quot.sound]\n\n"
    },
    {
      "iteration": 8,
      "provider": "openrouter_primary",
      "finish_reason": "stop",
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    {
      "iteration": 8,
      "event": "compile_proof",
      "provider": "openrouter_primary",
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      "banned_tokens": [],
      "proof_code": "intro h\nrcases h with \u27e8n, hn\u27e9\nlet x := \u03c0 ^ (\u03c0 ^ (\u03c0 ^ \u03c0))\nhave h_pos : 0 < x := rpow_pos_of_pos pi_pos _\nhave n_pos : 0 < n := by\n  have : (0 : \u211d) < (n : \u211d) := by rwa [\u2190 hn]\n  exact_mod_cast this\nhave h_not_integer : x \u2209 Set.range (Int.cast : \u2124 \u2192 \u211d) := by\n  intro (hx_mem : \u2203 m : \u2124, x = \u2191m)\n  let val := x\n  refine ?_\napply h_not_integer\nuse n\nexact hn.symm",
      "compiler_output_preview": "[path]:27:4: error: type mismatch at `intro hx_mem`has type\n  x \u2208 Set.range Int.cast : Prop\nbut is expected to have type\n  \u2203 m, x = \u2191m : Prop\n'Transcendental.pi_pow_pi_pow_pi_pow_pi_not_integer' depends on axioms: [propext, sorryAx, Classical.choice, Quot.sound]\n\n"
    }
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    "problem": {
      "axioms_check_name": "pi_pow_pi_pow_pi_pow_pi_not_integer",
      "axioms_check_skipped": false,
      "benchmark_id": "Wikipedia__Transcendental__pi_pow_pi_pow_pi_pow_pi_not_integer",
      "category": "research_open",
      "endings": [
        "end Transcendental"
      ],
      "imports": [
        "FormalConjectures.Util.ProblemImports"
      ],
      "preamble_chars": 167,
      "source_file": "FormalConjectures/Wikipedia/Transcendental.lean",
      "title": "pi_pow_pi_pow_pi_pow_pi_not_integer"
    },
    "returncode": 1,
    "status": "partial",
    "stderr": "",
    "stdout": "[path]:29:55: error: unsolved goals\ncase intro\nn : \u2124\nhn : \u03c0 ^ \u03c0 ^ \u03c0 ^ \u03c0 = \u2191n\nx : \u211d := \u03c0 ^ \u03c0 ^ \u03c0 ^ \u03c0\nhx : x = \u2191n\nh_pos : 0 < x\nn_pos : 0 < n\nm : \u2124\nhm : \u2191m = x\n\u22a2 False\n'Transcendental.pi_pow_pi_pow_pi_pow_pi_not_integer' depends on axioms: [propext, sorryAx, Classical.choice, Quot.sound]\n",
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}
Gemini 3 Flash Preview Failed -- Feb 14, 2026
have : 3.14 < π := Real.pi_gt_three.trans_le (by norm_num; linarith [Real.pi_gt_three]) linarith [Real.pi_gt_three] have h_pow_pos : 0 < π ^ π ^ π ^ π := by apply Real.rpow_pos_of_pos h_pi_pos have h_n_pos : 0 < (n : ℝ) := by rw [← hn] exact h_pow_pos have h_n_int : n > 0 := by norm_cast at h_n_pos exact h_n_pos have h_trans : Transcendental π := transcendental_pi have h_log : π ^ π ^ π ^ π = exp (π ^ π ^ π * log π) := by rw [Real.rpow_def_of_pos h_pi_pos] have h_eq : exp (π ^ π ^ π * log π) = n := by rw [← h_log, hn] apply Transcendental.transcendental_pi apply Transcendental.isAlgebraic_iff.mp rewrite [← hn] at * contrapose! h_trans exact transcendental_pi
View
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      "benchmark_id": "Wikipedia__Transcendental__pi_pow_pi_pow_pi_pow_pi_not_integer",
      "category": "research_open",
      "endings": [
        "end Transcendental"
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      "source_file": "FormalConjectures/Wikipedia/Transcendental.lean",
      "title": "pi_pow_pi_pow_pi_pow_pi_not_integer"
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    "stdout": "[path]:19:21: error: Function expected at\n  LT.lt.trans_le pi_gt_three ?m.209\nbut this term has type\n  3 < ?m.196\n\nNote: Expected a function because this term is being applied to the argument\n  linarith\n[path]:22:31: error: unknown identifier 'h_pi_pos'\n[path]:23:22: error: unknown identifier 'n'\n[path]:24:10: error: unknown identifier 'hn'\n[path]:26:17: error: unknown identifier 'n'\n[path]:29:32: error: Application type mismatch: In the application\n  @Transcendental \u03c0\nthe argument\n  \u03c0\nhas type\n  \u211d : Type\nbut is expected to have type\n  Type ?u.3061 : Type (?u.3061 + 1)\n[path]:29:37: error: unknown identifier 'transcendental_pi'\n[path]:31:29: error: unknown identifier 'h_pi_pos'\n[path]:32:40: error: unknown identifier 'n'\n[path]:33:17: error: unknown identifier 'hn'\n[path]:34:8: error: unknown constant 'Transcendental.transcendental_pi'\n[path]:35:2: error: no goals to be solved\n",
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