Square root problem with primes

From: Tapio (hurmecom_at_dlc.fi)
Date: 11/09/04 

Date: Tue, 09 Nov 2004 21:32:17 GMT

p and q are odd primes. n is positive integer.

When does square root n^2-pq equal to integer?

i.e. sqrt(n^2-pq)=integer ?

excluding trivial case n^2=pq+1 as sqrt(pq+1-pq)=1.

What is the common parametric equation for n as a function of p and q?

Tapio

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