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 A034031 #9 Jul 08 2025 20:03:15 %S A034031 1,2,3,6,11,17,19,22,33,34,38,41,43,51,57,59,66,67,73,82,83,86,89,97, %T A034031 102,107,113,114,118,123,129,131,134,137,139,146,163,166,177,178,179, %U A034031 187,193,194,201,209,211,214,219,226,227 %N A034031 Numbers that are primitively but not imprimitively represented by x^2+2y^2. %Y A034031 Cf. A002479, A097700, A057127, A034030-A034034. %K A034031 nonn %O A034031 1,2 %A A034031 _N. J. A. Sloane_ %E A034031 Corrected by _N. J. A. Sloane_, Apr 30 2015