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 A243169 #13 Jun 03 2022 14:55:52 %S A243169 0,3,8,11,12,23,27,32,39,44,47,48,59,71,72,75,83,92,99,104,107,108, %T A243169 111,128,131,143,147,156,167,176,179,183,188,191,192,200,207,219,227, %U A243169 236,239,243,251,263,264,275,284,288,291,296,299,300,311,327,332,347,351,359,363,368,383,392,396,407,416,419,423,428,431,432,443,444,467,471,479,488 %N A243169 Nonnegative integers of the form -x^2 + 6xy + 3y^2. %C A243169 Discriminant 48. %C A243169 Nonnegative integers of the form 3x^2 - 4y^2. - _Jon E. Schoenfield_, Jun 03 2022 %H A243169 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) %Y A243169 Primes in this sequence = A141187. %K A243169 nonn %O A243169 1,2 %A A243169 _N. J. A. Sloane_, Jun 01 2014