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 A309138 #5 Jul 14 2019 11:55:33 %S A309138 0,1,4,9,16,23,24,25,27,32,36,39,48,49,59,64,72,81,87,92,93,96,100, %T A309138 101,104,108,117,121,123,128,141,144,156,167,169,173,192,196,207,208, %U A309138 211,213,216,219,223,225,232,236,243,248,256,261,271,279,288,289,307,312 %N A309138 Nonnegative integers of the form x^2 + 23*y^2. %C A309138 Discriminant of positive definite binary quadratic form: -92. %H A309138 Peter Luschny, <a href="https://oeis.org/wiki/User:Peter_Luschny/BinaryQuadraticForms#Implementation">Binary Quadratic Forms</a> %H A309138 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 A309138 Primes in this sequence: A033217. %Y A309138 Cf. A028958. %K A309138 nonn %O A309138 1,3 %A A309138 _Hugo Pfoertner_, Jul 14 2019