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| Prime and Twice Square (Posted on 2016-10-22) |
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Determine all possible values of a prime number P such that each of P+1 and P2 + 1 is twice a perfect square.
Prove that these are the only ones.
A solution
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 | Comment 1 of 4
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P=7 7+1=8=2*(2^2) (7^2)+1=50=2*(5^2)
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Posted by Math Man
on 2016-10-22 11:49:50 |
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