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Kaya Renger Coordinator

15/05/2018 at 07:41
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Let P is an integer number , show that :

\(GCD\left(P^2-1;P^2+1\right)\ne1\)




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    Nguyễn Tùng Dương moderators 16/05/2018 at 00:30

    you may have some typos in your question. Let me give you a counterexample: take P = 4 or whatever even integer, $(4^2-1, 4^2+1)=1$


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