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 A237599 #22 Jun 03 2022 18:09:13 %S A237599 4,7,8,16,23,28,31,32,36,47,56,63,64,68,71,72,79,92,100,103,112,119, %T A237599 124,127,128,136,144,151,164,167,175,184,188,191,196,199,200,207,223, %U A237599 224,239,248,252,256,263,271,272,279,284,287,288,292,311,316,324,328 %N A237599 Positive integers k such that x^2 - 6xy + y^2 + k = 0 has integer solutions. %C A237599 Nonnegative numbers of the form 8x^2 - y^2. - _Jon E. Schoenfield_, Jun 03 2022 %H A237599 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) %e A237599 4 is in the sequence because x^2 - 6xy + y^2 + 4 = 0 has integer solutions, for example (x, y) = (1, 5). %Y A237599 Cf. A001653 (k = 4), A006452 (k = 7), A001541 (k = 8), A075870 (k = 16), A156066 (k = 23), A217975 (k = 28), A003499 (k = 32), A075841 (k = 36), A077443 (k = 56). %Y A237599 Cf. A031363, A084917, A237351, A237606, A237609, A237610. %Y A237599 For primes see A007522 and A141175. %Y A237599 For a list of sequences giving numbers and/or primes represented by binary quadratic forms, see the "Binary Quadratic Forms and OEIS" link. %K A237599 nonn %O A237599 1,1 %A A237599 _Colin Barker_, Feb 10 2014