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A122251 Numerators of Hankel transform of 1/(3n+1) (conjecture). 0
1, 9, 729, 4782969, 282429536481, 150094635296999121, 6461081889226673298932241, 2503155504993241601315571986085849, 8727963568087712425891397479476727340041449 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

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.

LINKS

Table of n, a(n) for n=0..8.

FORMULA

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

CROSSREFS

Cf. A122249.

Sequence in context: A053854 A053764 A255510 * A234611 A015481 A229930

Adjacent sequences:  A122248 A122249 A122250 * A122252 A122253 A122254

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Aug 27 2006

STATUS

approved

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Last modified July 21 21:14 EDT 2019. Contains 325199 sequences. (Running on oeis4.)