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 A155571 #4 Jul 14 2012 11:32:23
%S A155571 61,109,181,229,241,244,349,409,421,436,541,549,601,661,709,724,769,
%T A155571 829,900,916,964,976,981,1009,1021,1069,1129,1201,1225,1249,1321,1381,
%U A155571 1396,1429,1489,1521,1525,1549,1609,1621,1629,1636,1669,1684,1741,1744,1789
%N A155571 Intersection of A000404, A092572 and A154778: N = a^2 + b^2 = c^2 + 3d^2 = e^2 + 5f^2 for some positive integers a,b,c,d,e,f.
%o A155571 (PARI) isA155571(n,/* optional 2nd arg allows us to get other sequences */c=[5,3,1]) = { for(i=1,#c, for(b=1,sqrtint((n-1)\c[i]), issquare(n-c[i]*b^2) & next(2)); return);1}
%o A155571 for( n=1,1999, isA155571(n) & print1(n","))
%Y A155571 Cf. A000404, A154777, A092572, A097268, A154778, A155716, A155717, A155560-A155578.
%K A155571 easy,nonn
%O A155571 1,1
%A A155571 _M. F. Hasler_, Jan 25 2009