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 A155564 #3 Jul 14 2012 11:32:23
%S A155564 0,1,3,4,9,12,16,19,25,27,36,43,48,49,57,64,67,73,75,76,81,97,100,108,
%T A155564 121,129,139,144,147,163,169,171,172,192,193,196,201,211,219,225,228,
%U A155564 241,243,256,268,283,289,291,292,300,304,307,313,324,331,337,361,363
%N A155564 Intersection of A002479 and A003136: N = a^2 + 2b^2 = c^2 + 3d^2 for some integers a,b,c,d.
%C A155564 Contains A155574 as a subsequence (obtained by restricting a,b,c,d to be nonzero). Also contains A000290 (squares) as subsequence.
%o A155564 (PARI) isA155564(n,/* use optional 2nd arg to get other analogous sequences */c=[3,2]) = { for(i=1,#c, for(b=0,sqrtint(n\c[i]), issquare(n-c[i]*b^2) & next(2)); return);1}
%o A155564 for( n=1,500, isA155564(n) & print1(n","))
%Y A155564 Cf. A001481, A002479, A003136, A002481, A020668 ff.
%K A155564 easy,nonn
%O A155564 1,3
%A A155564 _M. F. Hasler_, Jan 25 2009