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 A028960 #12 Jul 08 2025 18:58:32 %S A028960 0,3,8,9,12,13,16,24,27,29,31,32,36,39,41,47,48,52,64,69,71,72,73,75, %T A028960 81,87,93,96,104,108,116,117,123,124,127,128,131,139,141,144,147,151, %U A028960 156,163,164,169,177,179,184,188,192,193,197,200 %N A028960 Numbers represented by quadratic form with Gram matrix [ 3, 1; 1, 8 ]. %C A028960 Nonnegative integers of the form 3*x^2 + 2*x*y + 8*y^2, discriminant -92. %H A028960 N. J. A. Sloane et al., <a href="https://oeis.org/wiki/Binary_Quadratic_Forms_and_OEIS">Binary Quadratic Forms and OEIS</a> (Index to related sequences, programs, references) %K A028960 nonn %O A028960 1,2 %A A028960 _N. J. A. Sloane_