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[数论] 一个简单的平方数问题

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realnumber Posted at 2013-11-18 15:26:50 |Read mode
江苏-冯``(12``````6) 15:12:01
若n为整数且n^2-4是一个完全平方数,求n




----n^2-4=t^2,
有(│n│-│t│)(│n│+│t│)=4
穷举都没多少$│n│+│t│\le4$
设想,从勾股数角度也可以解,如果数据修改更大的话$n^2-15^2=t^2$.

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其妙 Posted at 2013-11-20 21:26:51
两个完全平方数之间相差为4.

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