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Erdős problem / erdos

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Problem 249

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  1. vf_d7d44a2f3ce40a79

    theoretical

    Erdős Problem #249: declared status 'open'. Formalized: yes. Is∑nϕ(n)2n\sum_n \frac{\phi(n)}{2^n}irrational? Here ϕ\phi is the Euler totient function. Prize: no. OEIS: A256936. Tags: irrationality, number theory.

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