This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A088535 #6 Mar 31 2012 13:20:51 %S A088535 49,147,169,196,361,441,507,588,637,676,784,931,961,1083,1183,1225, %T A088535 1323,1369,1444,1519,1521,1764,1813,1849,1911,2028,2107,2352,2527, %U A088535 2548,2704,2793,2883,2989,3136,3211,3249,3283,3549,3577,3675,3721,3724,3844,3871 %N A088535 n representable as x^2+xy+y^2 and such that 3 divides sigma(n). %F A088535 n in A003136 and in A087943 %K A088535 nonn %O A088535 1,1 %A A088535 _Benoit Cloitre_, Nov 16 2003 %E A088535 More terms from _David Wasserman_, Aug 09 2005