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鉴于昨天探讨的数学题本人收获颇丰，今天再发一道有意思的数学题，感兴趣的快进来试试

 4 years ago
source link: https://www.v2ex.com/t/655363
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问与答 - @YUX - **定义:** d(n) 为 n 的所有除数之和(不包括 n 自身，最小为 1 )，例如:- 220 的除数是 1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110

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