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 A157075 #5 Jan 17 2013 12:47:48 %S A157075 10,26,34,50,58,74,82,106,122,130,146,170,178,194,202,218,226,250,274, %T A157075 290,298,314,338,346,362,370,386,394,410,442,458,466,482,514,530,538, %U A157075 554,562,578,586,610,626,634,650,674,698,706,730,746,754,778,794,802 %N A157075 Positive integers n for which the Diophantine equation x^2 + y^2 = n^2/2 has relatively prime solutions. %F A157075 a(n) = 2 * A008846(n). [From _N. J. A. Sloane_, Feb 24 2009] %K A157075 nonn %O A157075 1,1 %A A157075 Knut Angstrom (angstrom.knut(AT)telia.com), Feb 22 2009 %E A157075 Edited and extended by _Max Alekseyev_, Apr 22 2010