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A309135 Nonnegative integers of the form 9*x^2+7*x*y-5*y^2. 0

%I #5 Jul 14 2019 11:55:08

%S 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 71,75,76,80,81,83,85,95,97,99,100,103,108,111,121,125,129,132,135,

%U 144,147,149,151,153,159,165,167,171,172,176,180,181,183,185,187,192

%N Nonnegative integers of the form 9*x^2+7*x*y-5*y^2.

%C Discriminant of indefinite binary quadratic form: 229.

%H 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 Peter Luschny, <a href="https://oeis.org/wiki/User:Peter_Luschny/BinaryQuadraticForms#Implementation">Binary Quadratic Forms</a>

%H 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 (C++) See Jagy link.

%Y Primes in this sequence: A141165.

%K nonn

%O 1,2

%A _Hugo Pfoertner_, Jul 14 2019

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Last modified March 28 13:25 EDT 2024. Contains 371254 sequences. (Running on oeis4.)