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A065496 Numbers n such that sigma(n) is a nontrivial power, i.e. sigma(n) = a^b where a and b are greater than 1. +0
6
3, 7, 21, 22, 31, 66, 70, 81, 93, 94, 102, 110, 115, 119, 127, 142, 159, 170, 187, 210, 214, 217, 265, 282, 310, 322, 343, 345, 357, 364, 381, 382, 385, 400, 472, 497, 510, 517, 527, 642, 651, 679, 690, 710, 714, 742, 745, 770, 782, 795, 820, 862, 884, 889 (list; graph; listen)
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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.


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