A133323 Hex (or centered hexagonal) numbers that are prime powers of the form (6n+1)^k.

7, 19, 37, 61, 127, 169, 271, 331, 397, 547, 631, 919, 1657, 1801, 1951, 2269, 2437, 2791, 3169, 3571, 4219, 4447, 5167, 5419, 6211, 7057, 7351, 8269, 9241, 10267, 11719, 12097, 13267, 13669, 16651, 19441, 19927, 22447, 23497, 24571, 25117, 26227, 27361

Offset

1,1

Comments

Intersection of A003215 and A133290.

Links

Table of n, a(n) for n=1..43.

Eric Weisstein's World of Mathematics, Hex Number.

Crossrefs

Cf. A004611.

Sequence in context: A113743 A003215 A308685 * A002407 A098484 A155443

Adjacent sequences: A133320 A133321 A133322 * A133324 A133325 A133326

Keyword

nonn

Author

Mats Granvik, Oct 18 2007, Oct 19 2007

Status

approved