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A055711
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Numbers k such that k | sigma_7(k).
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6
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1, 6, 28, 86, 120, 145, 258, 290, 435, 496, 580, 588, 672, 696, 870, 946, 1032, 1305, 1720, 1740, 2245, 2610, 2712, 2838, 3164, 3282, 3408, 3480, 3724, 3784, 4060, 4490, 5160, 5220, 6735, 6786, 6960, 7830, 8514, 8980, 9436, 9492, 9632, 9976
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OFFSET
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1,2
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COMMENTS
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sigma_7(k) is the sum of the 7th powers of the divisors of k (A013955).
Problem 11090 proves that this sequence is infinite. - T. D. Noe, Apr 18 2006
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LINKS
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MATHEMATICA
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Do[If[Mod[DivisorSigma[7, n], n]==0, Print[n]], {n, 1, 10000}]
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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