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A103348 Denominators of sum_{k=1..n} 1/k^7 = Zeta(7,n). 5
1, 128, 279936, 35831808, 2799360000000, 933120000000, 768464444160000000, 98363448852480000000, 645362587921121280000000, 645362587921121280000000, 12576291107821424895098880000000, 12576291107821424895098880000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

For the numerators, comments and a link reference see A103347.

LINKS

Table of n, a(n) for n=1..12.

MATHEMATICA

s=0; lst={}; Do[s+=n^1/n^8; AppendTo[lst, Denominator[s]], {n, 3*4!}]; lst (* Vladimir Joseph Stephan Orlovsky, Jan 24 2009 *)

Table[ HarmonicNumber[n, 7] // Denominator, {n, 1, 12}] (* Jean-Fran├žois Alcover, Dec 04 2013 *)

CROSSREFS

Sequence in context: A222054 A283926 A016831 * A069446 A227605 A016879

Adjacent sequences:  A103345 A103346 A103347 * A103349 A103350 A103351

KEYWORD

nonn,frac,easy

AUTHOR

Wolfdieter Lang, Feb 15 2005

STATUS

approved

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Last modified May 24 09:41 EDT 2019. Contains 323529 sequences. (Running on oeis4.)