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 A034042 #9 Jul 08 2025 20:04:37 %S A034042 1,2,9,11,14,16,18,22,23,25,28,36,37,43,46,49,50,53,58,71,72,74,77,79, %T A034042 81,86,98,99,100,106,107,109,116,121,126,127,134,137,142,144,149,151, %U A034042 154,158,161,162,163,169,193,196,197,198,200,203,207,211,214 %N A034042 Numbers that are primitively or imprimitively represented by (x^2+xy+2y^2, x>=0, y>=0), but not both. %Y A034042 Cf. A034035-A034042. %K A034042 nonn %O A034042 1,2 %A A034042 _N. J. A. Sloane_ %E A034042 Definition corrected by _N. J. A. Sloane_, Apr 30 2015