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关于整数n能表示成两平方数之和的充要条件

Posted by beyonlin_SCUT at 2008-10-29 10:15:00 on Problem 3511
整数n能表示成两平方数之和的充要条件是在它的标准分解式中,形如4k+3的素因数的指数是偶数

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