PUMaC 2008 · 数论（A 组） · 第 8 题

PUMaC 2008 — Number Theory (Division A) — Problem 8

(5 points)Find all sets of three primes p , q , and r such that p + q = r and ( r − p )( q − p ) − 27 p is a perfect square. 2 2 2

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