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A070763
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Numbers n such that sigma(n) is a power of prime (of the form p^a, p prime, a>=1).
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0
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2, 3, 4, 7, 9, 16, 21, 25, 31, 64, 81, 93, 127, 217, 289, 381, 400, 651, 729, 889, 1681, 2401, 2667, 3481, 3937, 4096, 5041, 7921, 8191, 10201, 11811, 15625, 17161, 24573, 27559, 27889, 28561, 29929, 57337, 65536, 82677, 83521, 85849
(list; graph; refs; listen; history; internal format)
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