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China National Olympiad
2009 China National Olympiad
2
Prime number
Prime number
Source: Chinese National Olympiad 2009 P2
January 10, 2009
number theory
relatively prime
number theory proposed
Problem Statement
Find all the pairs of prime numbers
(
p
,
q
)
(p,q)
(
p
,
q
)
such that pq|5^p\plus{}5^q.
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