Re: x^2 - Ay^2 =1

Philippe wrote:

The solutions of Q = sqrt(421n^2-420) is composed of a >>set of 24 fundamental solutions (I gave just some in >>my previous post) for n = 1, 41, 1067, ..., Q = 1, >>841, 21893

I am sorry for my language.

for the all Pell's equation
X^2-Ay^2=1
y=(n+sqrt(A*n^2-(A-1))=0 mod(A-1)

then for X^2-421Y^2=1
y=(n+sqrt(421n^2-420))=0 mod(420)

Regards
Vincenzo Librandi
vincenzo.librandweoz@xxxxxxxx
.