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Ireland Contests
Ireland National Math Olympiad
2001 Irish Math Olympiad
1
find a number
find a number
Source: Ireland 2001
July 5, 2009
modular arithmetic
number theory unsolved
number theory
Problem Statement
Find the least positive integer
a
a
a
such that
2001
2001
2001
divides 55^n\plus{}a \cdot 32^n for some odd
n
n
n
.
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