Re: [math-fun] Finding numbers represented by indefinite binary quadratic forms

I'd consult Henri Cohen: A Course in Computational Algebraic Number Theory, Springer-Verlag, (1993). (one of "The Book"s out there) Best, jj * Neil Sloane <njasloane@gmail.com> [Jun 04. 2014 20:01]:

Does anyone have a program for doing the following:

Given an indefinite binary quadratic form ax^2+bxy+cy^2 (with discriminant b^2-4ac>0 and not a square) and a positive or negative number n, decide if ax^2+bxy+cy^2 = n has a solution.

(If n = p is a prime, one can use the PARI command qfbsolve(Qfb(a,b,c),p) )

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