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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A213623 Numbers n such that the denominator of the Bernoulli polynomial B(n,x) equals the Clausen number C(n), {n | A144845(n) = A141056(n)}.

Original entry on oeis.org

0, 1, 2, 3, 4, 6, 8, 10, 12, 16, 24, 28, 30, 36, 48, 60, 120
Offset: 0

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Author

Peter Luschny, Jun 16 2012

Keywords

Comments

Is this a finite sequence?

Crossrefs

Programs

  • Maple
    # Clausen(n, k) defined in A160014.
    seq(`if`(denom(bernoulli(i,x))=Clausen(i,1),i,NULL), i=0..120);
  • Mathematica
    Clausen[n_, k_] := If[n == 0, 1, Times @@ (Select[Divisors[n], PrimeQ[# + k]&] + k)];
    Select[Range[0, 120], Denominator[BernoulliB[#, x] // Together] == Clausen[#, 1]&] (* Jean-François Alcover, Aug 13 2019 *)
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