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[数论] 如何判断一次多项式是否存在平方数

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tommywong Posted at 2014-7-12 19:08:20 |Read mode
Last edited by tommywong at 2014-7-12 19:26:00$y=3x+1=4,7,10,13,...$

$y=3x+2=5,8,11,14,...$
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realnumber Posted at 2014-7-12 21:20:29
回复 1# tommywong


    整系数的y=kx+b,就是平方剩余问题,
$x^2=0,1 \mod3$,所以y=3x+1,y=3x存在平方数,y=3x+2没有,$x\in N$.

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