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erdos_252_ge_5

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For a fixed `k ≥ 5`, is `∑ σ k n / n!` irrational?.

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Lean 4 Statement 
theorem erdos_252_ge_5 : answer(sorry) ↔
    ∀ k ≥ 5, Irrational (∑' n, σ k n / (n ! : ℝ))
ID: ErdosProblems__252__erdos_252_ge_5
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