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 A309135 #5 Jul 14 2019 11:55:08 %S A309135 0,3,5,9,11,12,15,17,19,20,25,27,33,36,43,44,45,48,51,55,57,60,61,68, %T A309135 71,75,76,80,81,83,85,95,97,99,100,103,108,111,121,125,129,132,135, %U A309135 144,147,149,151,153,159,165,167,171,172,176,180,181,183,185,187,192 %N A309135 Nonnegative integers of the form 9*x^2+7*x*y-5*y^2. %C A309135 Discriminant of indefinite binary quadratic form: 229. %H A309135 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 A309135 Peter Luschny, <a href="https://oeis.org/wiki/User:Peter_Luschny/BinaryQuadraticForms#Implementation">Binary Quadratic Forms</a> %H A309135 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 A309135 (C++) See Jagy link. %Y A309135 Primes in this sequence: A141165. %K A309135 nonn %O A309135 1,2 %A A309135 _Hugo Pfoertner_, Jul 14 2019