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$n!+1$ being a perfect square
Solving $$x!+1=y^2$$ integer solutions,
example：$(4,5),(5,11),(7,71)$
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tianzhidaosunyouyu
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2http://math.stackexchange.com/questions/7938/n1-being-a-perfect-square/7940#7940 – Oct 01 '12 at 12:15
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You mean $(7, 71)$? – PAD Oct 01 '12 at 12:16
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Do we need to play 20 questions to figure out what your question is? :) – rschwieb Oct 01 '12 at 12:18
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1This question is isomorphic to the question it contains in the sense that it has been recently closed. – Ragib Zaman Oct 01 '12 at 13:35
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I have given a proof in : http://math.stackexchange.com/a/1892315/179940 – Michael Aug 15 '16 at 03:40