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

Dario Alpern's site http://www.alpertron.com.ar/QUAD.HTM may be useful. On Tue, Jun 3, 2014 at 11:41 PM, Neil Sloane <njasloane@gmail.com> wrote:

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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