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2022 IMO Shortlist
N2
Factorial Divisibility
Factorial Divisibility
Source: IMO SL 2022 N2
July 9, 2023
number theory
divsibility
primes
Problem Statement
Find all positive integers
n
>
2
n>2
n
>
2
such that
n
!
∣
∏
p
<
q
≤
n
,
p
,
q
primes
(
p
+
q
)
n! \mid \prod_{ p<q\le n, p,q \, \text{primes}} (p+q)
n
!
∣
p
<
q
≤
n
,
p
,
q
primes
∏
(
p
+
q
)
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