A309133 - OEIS

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A309133

Nonnegative integers of the form 4*x^2+6*x*y-7*y^2.

0, 3, 4, 7, 9, 11, 12, 16, 21, 27, 28, 33, 36, 41, 44, 47, 48, 49, 53, 63, 64, 71, 73, 75, 77, 81, 83, 84, 99, 100, 101, 108, 111, 112, 121, 123, 127, 132, 141, 144, 147, 148, 149, 157, 159, 164, 173, 175, 176, 181, 188, 189, 192, 196, 197, 201, 211, 212, 213

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Discriminant of indefinite binary quadratic form: 148.

LINKS

Table of n, a(n) for n=1..59.

Will Jagy, C++ program Conway_Positive_All.cc to find all positive numbers represented by an indefinite binary quadratic form

Peter Luschny, Binary Quadratic Forms

N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references)

PROG

(C++) See Jagy link.