Search: id:A007480
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%I A007480 M5028
%S A007480 1,16,1296,20736,12960000,12960000,31116960000,497871360000,
%T A007480 40327580160000,40327580160000,590436101122560000,590436101122560000,
%U A007480 16863445484161436160000,16863445484161436160000,16863445484161436160000
%N A007480 Denominators of Sum k^(-4); k = 1..n.
%D A007480 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A007480 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.
%H A007480 T. D. Noe, <a href="b007480.txt">Table of n, a(n) for n=1..200</a>
%t A007480 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]
%Y A007480 Cf. A007410.
%Y A007480 Sequence in context: A072161 A163929 A072914 this_sequence A163395 A134375 
               A057994
%Y A007480 Adjacent sequences: A007477 A007478 A007479 this_sequence A007481 A007482 
               A007483
%K A007480 nonn,easy,frac
%O A007480 1,2
%A A007480 N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein

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