A248913 A248614(n+1) - A248614(n).

1, 1, 2, 2, 4, 2, 4, 2, 2, 2, 6, 2, 6, 4, 2, 2, 2, 2, 4, 6, 2, 6, 4, 2, 6, 2, 2, 2, 4, 2, 2, 4, 4, 2, 4, 2, 2, 2, 4, 4, 6, 4, 2, 4, 2, 2, 4, 4, 2, 6, 6, 2, 2, 6, 2, 2, 2, 2, 10, 2, 4, 2, 2, 4, 4, 2, 2, 4, 4, 2, 4, 2, 2, 2, 2, 4, 2, 6, 4, 2, 4, 4, 2, 2, 4, 2

Offset

0,3

Comments

From Bernoulli numbers A027642.

The first different numbers of a(n), i.e., 1, 2, 4, 6, 10, ... = A248614(1, 2, 3, 4, 5, ...) are at rank 0, 2, 4, 10, 58, ... .

Links

Michel Marcus, Table of n, a(n) for n = 0..842

Index entries for sequences related to Bernoulli numbers

Prog

(PARI) lista() = {vbden = readvec("c:/gp/bfiles/b027642.txt"); vredu = readvec("c:/gp/bfiles/b090126.txt"); vrank = []; for (i=1, #vredu, val = vredu[i]; k = 1; while(vbden[k] != val, k++); vrank = concat(vrank, k-1); ); for (i=2, #vrank, print1(vrank[i] - vrank[i-1], ", "); ); } \\ Michel Marcus, Nov 08 2014

Crossrefs

Cf. A027642, A090126, A248614.

Sequence in context: A131817 A214430 A138232 * A227951 A102641 A054763

Adjacent sequences: A248910 A248911 A248912 * A248914 A248915 A248916

Keyword

nonn

Author

Paul Curtz, Oct 16 2014

Extensions

More terms from Michel Marcus, Nov 08 2014

Status

approved