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 A081864 Sum of 5th powers of the divisors of odd numbers: a(n) = sigma_5(2n-1). (Formerly N2353) 1
 1, 244, 3126, 16808, 59293, 161052, 371294, 762744, 1419858, 2476100, 4101152, 6436344, 9768751, 14408200, 20511150, 28629152, 39296688, 52541808, 69343958, 90595736, 115856202, 147008444, 185349918, 229345008, 282492057, 346445352 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 REFERENCES N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). LINKS Amiram Eldar, Table of n, a(n) for n = 1..10000 J. W. L. Glaisher, On the representations of a number as the sum of two, four, six, eight, ten, and twelve squares, Quart. J. Math. 38 (1907), 1-62 (see p. 56). MAPLE with(numtheory); [seq(sigma[5](2*n-1), n=1..100)]; MATHEMATICA DivisorSigma[5, Range[1, 61, 2]] (* Harvey P. Dale, Jan 12 2016 *) PROG (PARI) a(n) = sigma(2*n-1, 5); \\ Michel Marcus, Aug 17 2019 (MAGMA) [DivisorSigma(5, 2*n-1):n in [1..30]]; // Marius A. Burtea, Aug 17 2019 CROSSREFS Cf. A001160. Sequence in context: A203349 A262092 A178266 * A002594 A194134 A085440 Adjacent sequences:  A081861 A081862 A081863 * A081865 A081866 A081867 KEYWORD nonn AUTHOR N. J. A. Sloane. This sequence was in the 1973 "Handbook", but then was deleted from the database because of confusion with A002594. Resubmitted by Benoit Cloitre, Apr 12 2003. Entry revised by N. J. A. Sloane, Jun 10 2012 EXTENSIONS Definition clarified by Harvey P. Dale, Jan 12 2016 STATUS approved

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Last modified September 18 04:22 EDT 2021. Contains 347508 sequences. (Running on oeis4.)