1999 IMO Problems/Problem 4

Problem

Determine all pairs $(n,p)$ of positive integers such that

$p$ is a prime, $n$ not exceeded $2p$ , and $(p-1)^{n}+1$ is divisible by $n^{p-1}$

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1999 IMO (Problems) • Resources
Preceded by Problem 3	1 • 2 • 3 • 4 • 5 • 6	Followed by Problem 5
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