回复：Maybe I am wrong. An Counterexample.

cma · 2012-03-11 13:04:23Z

回复：Maybe I am wrong. An Counterexample.简介

来源: cma 于 2012-03-11 13:04:23 [档案] [旧帖] [给我悄悄话] 本文已被阅读：次 (163 bytes)

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回答: Maybe I am wrong. An Counterexample. 由 wxcfan123 于 2012-03-11 12:04:18

Thanks.

But why 3y^2+286 is not square number?

suppose 3y^2+13, 13 has no factor of 3 and is not a square nubmer. But let y=1, it is 16=4*4.

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