9.7

Part of 1994 All-Russian Olympiad Regional Round

Problems(1)

p^2+qs, p^2 +qr perfect squares - All-Russian MO 1994 Regional (R4) 9.7

Source:

Find all prime numbers

p,q,r,s

such that their sum is a prime number and

p^2+qs

p^2 +qr

are squares of integers.

number theoryPerfect Square