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Search: id:A017698
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| A017698 |
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Denominator of sum of -17 th powers of divisors of n. |
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+0
2
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| 1, 131072, 129140163, 17179869184, 762939453125, 1410554953728, 232630513987207, 2251799813685248, 16677181699666569, 50000000000000000, 505447028499293771, 554652776685109248, 8650415919381337933
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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. A017697.
Sequence in context: A022533 A069392 A069278 this_sequence A010805 A138032 A017697
Adjacent sequences: A017695 A017696 A017697 this_sequence A017699 A017700 A017701
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KEYWORD
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nonn,frac
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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