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 A272933 #7 Sep 08 2022 08:46:16
%S A272933 0,1,4,9,12,13,16,21,25,28,36,37,48,49,52,57,61,64,73,76,81,84,93,97,
%T A272933 100,108,109,112,117,121,124,129,133,144,148,156,157,169,172,181,189,
%U A272933 192,193,196,201,208,217,225,228,229,237,241,244,252,256,268,273,277
%N A272933 Numbers of the form x^2 + 12*y^2.
%C A272933 x^2 + 12*y^2 has discriminant -48.
%C A272933 All terms are congruent to {0, 1, 4, 9, 12, 13, 16, 21, 25, 28} (mod 36).
%C A272933 Norms of numbers in Z[sqrt(-12)].
%o A272933 (Magma) [n: n in [0..277] | NormEquation(12, n) eq true];
%Y A272933 Cf. A003136. A068228 gives the primes.
%K A272933 nonn,easy
%O A272933 1,3
%A A272933 _Arkadiusz Wesolowski_, May 11 2016