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 A243185 #12 Oct 16 2024 15:49:25
%S A243185 0,1,3,4,9,12,16,22,25,27,31,34,36,37,48,49,58,64,66,67,75,81,82,88,
%T A243185 93,97,100,102,103,108,111,121,124,136,144,147,148,157,163,166,169,
%U A243185 174,181,187,192,196,198,199,201,202,214,223,225,229,232,243,246,256,262,264,268,279,289,291,298,300
%N A243185 Nonnegative numbers of the form -2*x^2+3*x*y+3*y^2.
%C A243185 Discriminant 33.
%H A243185 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)
%t A243185 Reap[For[n = 0, n <= 300, n++, If[Reduce[-2*x^2 + 3*x*y + 3*y^2 == n, {x, y}, Integers] =!= False, Sow[n]]]][[2, 1]] (* In older versions, this program used to miss out 0 *)
%Y A243185 For primes see A141177. Cf. A243184.
%K A243185 nonn
%O A243185 1,3
%A A243185 _N. J. A. Sloane_, Jun 04 2014