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 A257346 #3 Apr 30 2015 14:18:45 %S A257346 3,5,6,10,12,13,15,17,19,20,21,24,26,27,30,31,33,34,35,38,39,40,41,42, %T A257346 45,47,48,51,52,54,55,57,59,60,61,62,65,66,68,69,70,73,75,76,78,80,82, %U A257346 83,84,85,87,89,90,91,93,94,95,96,97,101 %N A257346 Numbers not of the form x^2+xy+2y^2. %Y A257346 Complement of A028951. %K A257346 nonn %O A257346 1,1 %A A257346 _N. J. A. Sloane_, Apr 30 2015