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 A309133 #7 Jul 14 2019 11:54:35 %S A309133 0,3,4,7,9,11,12,16,21,27,28,33,36,41,44,47,48,49,53,63,64,71,73,75, %T A309133 77,81,83,84,99,100,101,108,111,112,121,123,127,132,141,144,147,148, %U A309133 149,157,159,164,173,175,176,181,188,189,192,196,197,201,211,212,213 %N A309133 Nonnegative integers of the form 4*x^2+6*x*y-7*y^2. %C A309133 Discriminant of indefinite binary quadratic form: 148. %H A309133 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 A309133 Peter Luschny, <a href="https://oeis.org/wiki/User:Peter_Luschny/BinaryQuadraticForms#Implementation">Binary Quadratic Forms</a> %H A309133 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 A309133 (C++) See Jagy link. %Y A309133 Primes in this sequence: A141161. %K A309133 nonn %O A309133 1,2 %A A309133 _Hugo Pfoertner_, Jul 14 2019