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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A122251 Numerators of Hankel transform of 1/(3n+1) (conjecture).

Original entry on oeis.org

1, 9, 729, 4782969, 282429536481, 150094635296999121, 6461081889226673298932241, 2503155504993241601315571986085849, 8727963568087712425891397479476727340041449
Offset: 0

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Author

Paul Barry, Aug 27 2006

Keywords

Comments

General conjecture: numerators of Hankel transform of 1/(p*n+1) are given by (p^2)^sum{k=1..n, sum{j=0..n, floor(k/p^j)}}, for prime p.

Crossrefs

Cf. A122249.

Formula

a(n)=9^A122250(n); a(n)=9^sum{k=1..n, sum{j=0..n, floor(k/3^j)}};
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