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 A155710 #3 Jul 14 2012 11:32:23
%S A155710 21,36,49,61,84,109,129,144,181,189,196,201,229,241,244,301,309,324,
%T A155710 336,349,381,409,421,436,441,469,489,516,525,541,549,576,601,661,669,
%U A155710 709,721,724,756,769,784,804,829,849,889,900,916,921,964,976,981,1009,1021
%N A155710 Intersection of A092572 and A154778: N = a^2 + 3b^2 = c^2 + 5d^2 for some positive integers a,b,c,d.
%C A155710 Subsequence of A155570 (where a,b,c,d may be zero).
%o A155710 (PARI) isA155710(n,/* use optional 2nd arg to get other analogous sequences */c=[5,3]) = { for(i=1,#c, for(b=1,sqrtint((n-1)\c[i]), issquare(n-c[i]*b^2) & next(2)); return);1}
%o A155710 for( n=1,1111, isA155710(n) & print1(n","))
%Y A155710 Cf. A000404, A154777, A092572, A097268, A154778, A155716, ...
%K A155710 easy,nonn
%O A155710 1,1
%A A155710 _M. F. Hasler_, Jan 25 2009