|Bill Allombert on Fri, 20 May 2016 14:21:16 +0200|
[Date Prev] [Date Next] [Thread Prev] [Thread Next] [Date Index] [Thread Index]
|Re: What am I doing wrong?|
On Fri, May 20, 2016 at 01:59:14PM +0200, Dirk Laurie wrote: > % qfbsolve(Qfb(1,0,-5),4) > %2 = 0 > > Why are the solutions x=3,y=1; x=7,y=3; x=18,y=8; etc not found? Because 4 is not prime: ? ?qfbsolve qfbsolve(Q,p): Return [x,y] so that Q(x,y)=p where Q is a binary quadratic form and p a prime number, or 0 if there is no solution. Cheers, Bill.