%I A133323
%S A133323 7,19,37,61,127,169,271,331,397,547,631,919,1657,1801,1951,2269,2437,
%T A133323 2791,3169,3571,4219,4447,5167,5419,6211,7057,7351
%N A133323 Hex (or centered hexagonal) numbers that are prime powers of the form 
               (6n+1)^k.
%H A133323 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               HexNumber.html">Hex Number</a>.
%Y A133323 Subsequence of A003215.
%Y A133323 Sequence in context: A023224 A113743 A003215 this_sequence A002407 A098484 
               A155443
%Y A133323 Adjacent sequences: A133320 A133321 A133322 this_sequence A133324 A133325 
               A133326
%K A133323 nonn
%O A133323 1,1
%A A133323 Mats Granvik (mgranvik(AT)abo.fi), Oct 18 2007, Oct 19 2007