A067777 - OEIS

A067777

Numbers k such that (2*k)! * B(6*k) is an integer where B(k) are the Bernoulli numbers B(1)=-1/2 B(2)=1/6 B(4)=-1/30... B(2*m+1)=0 m>1.

19, 28, 31, 43, 49, 57, 59, 67, 71, 79, 82, 84, 85, 88, 93, 97, 106, 108, 109, 117, 127, 129, 130, 133, 139, 145, 148, 149, 150, 157, 159, 160, 163, 164, 167, 169, 171, 184, 185, 193, 196, 197, 199

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OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

MATHEMATICA

Select[Range[200], IntegerQ[(2*#)! * BernoulliB[6*#]] &] (* Amiram Eldar, May 17 2021 *)

CROSSREFS

Cf. A027641, A027642.

Sequence in context: A291884 A173639 A091448 * A065207 A084364 A094677

Adjacent sequences: A067774 A067775 A067776 * A067778 A067779 A067780

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Feb 06 2002

STATUS

approved