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erdos_257

Specification

Let $A\subseteq\mathbb{N}$ be an infinite set. Is $$ \sum_{n\in A} \frac{1}{2^n - 1} $$ irrational?

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Lean 4 Statement 
theorem erdos_257 : answer(sorry) ↔ ∀ (A : Set ℕ), A.Infinite →
    Irrational (∑' n : A, (1 : ℝ) / (2 ^ n.1 - 1))
ID: ErdosProblems__257__erdos_257
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