本帖最后由 awei 于 2019-5-30 05:25 编辑
完美数因数的倒数和等于2,例如:1/1+1/2+1/3+1/6=2;1/1+1/2+1/4+1/7+1/14+1/28=2。
能复合楼主的要求,但是奇完美数,至今还是个谜
1……6
2……28
3……496
4……8,128
5……33,550,336
6……8,589,869,056
7……137,438,691,328
8……2,305,843,008,139,952,128
9……2,658,455,991,569,831,744,654,692,615,953,842,176
10……191,561,942,608,236,107,294,793,378,084,303,638,130,997,321,548,169,216
11……13,164,036,458,569,648,337,239,753,460,458,722,910,223,472,318,386,943,117,783,728,128
12……14,474,011,154,664,524,427,946,373,126,085,988,481,573,677,491,474,835,889,066,354,349,131,199,152,128 |