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Search: id:A017669
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| A017669 |
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Numerator of sum of -3 th powers of divisors of n. |
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+0
2
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| 1, 9, 28, 73, 126, 7, 344, 585, 757, 567, 1332, 511, 2198, 387, 392, 4681, 4914, 757, 6860, 4599, 1376, 2997, 12168, 455, 15751, 9891, 20440, 3139, 24390, 147, 29792, 37449, 4144, 22113, 6192, 55261
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OFFSET
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1,2
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COMMENT
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Sum_{d|n} 1/d^k is equal to sigma_k(n)/n^k. So sequences A017665-A017712 also give the numerators and denominators of sigma_k(n)/n^k for k = 1..24. The power sums sigma_k(n) are in sequences A000203 (k=1), A001157-A001160 (k=2,3,4,5), A013954-A013972 for k = 6,7,...,24. - comment from Ahmed Fares (ahmedfares(AT)my-deja.com), Apr 05 2001.
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CROSSREFS
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Cf. A017670.
Sequence in context: A009255 A062451 A065959 this_sequence A001158 A053819 A085292
Adjacent sequences: A017666 A017667 A017668 this_sequence A017670 A017671 A017672
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KEYWORD
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nonn,frac
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AUTHOR
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njas
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