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 A309134 #8 Jul 14 2019 11:54:58 %S A309134 0,1,4,9,12,16,21,25,27,28,33,36,37,44,48,49,63,64,67,77,81,84,99,100, %T A309134 107,108,112,121,123,132,137,139,141,144,147,148,151,159,164,169,176, %U A309134 188,189,192,196,212,213,219,225,231,233,243,249,252,256,268,269,284 %N A309134 Nonnegative integers of the form x^2+12*x*y-y^2. %C A309134 Discriminant of indefinite binary quadratic form: 148. %H A309134 Will Jagy, <a href="/A243655/a243655.txt">C++ program Conway_Positive_All.cc to find all positive numbers represented by an indefinite binary quadratic form</a> %H A309134 Peter Luschny, <a href="https://oeis.org/wiki/User:Peter_Luschny/BinaryQuadraticForms#Implementation">Binary Quadratic Forms</a> %H A309134 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) %o A309134 (C++) See Jagy link. %Y A309134 Primes in this sequence: A141163. %K A309134 nonn %O A309134 1,3 %A A309134 _Hugo Pfoertner_, Jul 14 2019