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 A243165 #10 Jun 03 2022 14:55:44 %S A243165 0,2,3,5,8,12,13,18,20,27,30,32,37,43,45,48,50,52,53,62,67,72,75,78, %T A243165 80,82,83,93,98,107,108,117,120,123,125,128,130,142,147,148,155,157, %U A243165 158,162,163,172,173,178,180,192,195,197,200,205,208,212,213,222,227,237,242,243,245,248,258,267,268,270,277,283 %N A243165 Nonnegative integers of the form 2x^2 + 4xy - 3y^2. %C A243165 Discriminant 40. %C A243165 From _Jon E. Schoenfield_, Jun 03 2022: (Start) %C A243165 Also nonnegative integers of the form 5x^2 - 2y^2. %C A243165 Also nonnegative integers of the form 2x^2 - 5y^2. (End) %H A243165 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 A243165 Primes in this sequence = A141179. %K A243165 nonn %O A243165 1,2 %A A243165 _N. J. A. Sloane_, May 31 2014