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# 盈数
[数列信息 OEIS](https://oeis.org/A005101)
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盈数Abundant Number又称过剩数是指一个正整数其所有真因数proper divisors即不包括自身的所有正因数之和大于该数本身。
所以质数不是盈数。这一点困惑了我一下,因为对真因数理解出误而致。这里特别记录以下这个问题。
自然解法三最好不使用其他package的解法速度也最快。