[seqfan] Re: Finding numbers represented by indefinite binary quadratic forms

Max Alekseyev maxale at gmail.com
Wed Jun 4 13:42:59 CEST 2014

There is an online solver for this kind of equaitons by Dario Alpern:
(which however does not always work correctly)


On Wed, Jun 4, 2014 at 12:41 AM, Neil Sloane <njasloane at 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) )
> Neil
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