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.

A120626 Least number k such that the k-th Catalan number C(2k,k)/(k+1) is divisible by n!.

Original entry on oeis.org

1, 2, 5, 14, 14, 46, 46, 382, 446, 1662, 1662, 3582, 3582, 4094, 4094, 130942, 130942, 458238, 458238, 1040382, 1046526, 2883582, 3129342, 16760830, 16760830, 56623102, 66584318, 367001598, 367001598, 670826494, 670826494, 8589672446, 12348030974
Offset: 1

Views

Author

Robert G. Wilson v, Jun 19 2006

Keywords

Crossrefs

Programs

  • Mathematica
    f[0] = 1, f[n_] := Block[{k = f[n - 1]}, While[ !IntegerQ[ Binomial[2k, k]/(n!(k + 1))], k++ ]; k]; Array[f, 20]

Extensions

a(16)-a(17) from Ryan Propper, Oct 13 2006
Further terms from Ryan Propper, Dec 25 2007
Further terms from Max Alekseyev, Feb 04 2008