40个完全数分别是哪些?
问题描述：
40个完全数分别是哪些?
答
n取下列值时,(2^n-1)*2^(n-1)是前40个完全数： 2,3,5,7,13,17,19,31,61,89,107,127,521,607,1279,2203,2281,3217,4253,4423,9689,9941,11213,19937,21701,23209,44497,86243,110503,132049,216091,756839,859433,125...