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erdos_252_2

Specification

`∑ σ 2 n / n!` is irrational. This is proved in [ErKa54].

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Lean 4 Statement 
theorem erdos_252_2 : Irrational (∑' n, σ 2 n / (n ! : ℝ))
ID: ErdosProblems__252__erdos_252_2
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