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

Author

Paul Curtz, Oct 16 2014

Keywords

• nonn

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

Crossrefs

Cf. A027642, A090126, A248614.

Programs

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

Extensions

More terms from Michel Marcus, Nov 08 2014