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Re:请教一下为什么是求n以内完全平方数个数?谢谢

Posted by li900309 at 2010-03-01 12:47:48 on Problem 1218
In Reply To:Re:请教一下为什么是求n以内完全平方数个数?谢谢 Posted by:kyiyang at 2009-07-16 16:16:30
> 就是求一个数的约数个数。若有奇数个约数,开门;偶数个,关门。
> 设有一数N有有约数B,则必有另一约数N/B,其总是成对出现。惟独完全平方数N=B*B,此是只有一个约数了,完全平方数的约数为奇数个。

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