摘要： 转换成1到n的约数和 写一下 F(1) = {1}; F(2) = {1, 2}; F(3) = {1, 3}; F(4) = {1, 2, 4}; F(5) = {1, 5}; F(6) = {1, 2, 3, 6}; 所以就是在求 (n/1) 1 + (n/2) 2+(n/3) 3+(n/4) 阅读全文