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Search: id:A007480
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| A007480 |
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Denominators of Sum k^(-4); k = 1..n.
(Formerly M5028)
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+0
10
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| 1, 16, 1296, 20736, 12960000, 12960000, 31116960000, 497871360000, 40327580160000, 40327580160000, 590436101122560000, 590436101122560000, 16863445484161436160000, 16863445484161436160000, 16863445484161436160000
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
D. Y. Savio, E. A. Lamagna and S.-M. Liu, Summation of harmonic numbers, pp. 12-20 of E. Kaltofen and S. M. Watt, editors, Computers and Mathematics, Springer-Verlag, NY, 1989.
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..200
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MATHEMATICA
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s=0; lst={}; Do[s+=n^1/n^5; AppendTo[lst, Denominator[s]], {n, 3*4!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Jan 24 2009]
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CROSSREFS
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Cf. A007410.
Sequence in context: A072161 A163929 A072914 this_sequence A163395 A134375 A057994
Adjacent sequences: A007477 A007478 A007479 this_sequence A007481 A007482 A007483
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KEYWORD
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nonn,easy,frac
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein
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