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erdos_249

Specification

Is $$\sum_{n} \frac{\phi(n)}{2^n}$$ irrational? Here $\phi$ is the Euler totient function.

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Lean 4 Statement 
theorem erdos_249 : answer(sorry) ↔ Irrational (∑' n : ℕ, (φ n) / (2 ^ n))
ID: ErdosProblems__249__erdos_249
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