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Find the number of ordered triples (p,q,r) ( p,q,r )(p,q,r) of primes such that pq=r+1pq=r+1pq=r+1 and 2(p2+q2)=r2+12(p^2+q^2)=r^2+1 2(p2+q2)=r2+1.
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