cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A237873 Denominator of Sum_{i=1..n} n^i/i.

Original entry on oeis.org

1, 1, 2, 3, 12, 5, 20, 105, 280, 63, 2520, 385, 5544, 6435, 8008, 45045, 144144, 85085, 116688, 2909907, 739024, 146965, 232792560, 37182145, 356948592, 128707425, 2974571600, 717084225, 80313433200, 215656441, 30247916400, 4512611027925, 486207248800
Offset: 1

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Author

Bruno Berselli, Feb 14 2014

Keywords

Comments

The sequence gives the denominators of -n^(n+1)*Phi(n,1,n+1)-log(-n+1) for n>1, where Phi is the Lerch transcendent.

Crossrefs

Cf. A236772, A237872 (numerators)

Programs

  • Magma
    terms:=40; s:=[&+[n^i/i: i in [1..n]]: n in [1..terms]]; [Denominator(s[n]): n in [1..terms]];
  • Mathematica
    f[n_] := Sum[n^i/i, {i, 1, n}]; Table[Denominator[f[n]], {n, 1, 40}]
Showing 1-1 of 1 results.