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A055713
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Numbers k such that k | sigma_9(k).
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6
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1, 6, 38, 42, 54, 114, 120, 135, 168, 190, 216, 222, 266, 270, 280, 285, 312, 342, 378, 456, 496, 540, 570, 672, 728, 760, 798, 840, 888, 945, 1026, 1064, 1080, 1140, 1330, 1512, 1554, 1560, 1710, 1782, 1806, 1862, 1890, 1962, 1976, 1995, 1998, 2160, 2166
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OFFSET
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1,2
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COMMENTS
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sigma_9(k) is the sum of the 9th powers of the divisors of k (A013957).
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[9, n], n]==0, Print[n]], {n, 1, 5000}]
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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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