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1985 IMO Longlists
90
Factorise 5^{1985}-1
Factorise 5^{1985}-1
Source: IMO shortlist-1985
March 28, 2010
number theory unsolved
number theory
Problem Statement
Factorise 5^{1985}\minus{}1 as a product of three integers, each greater than
5
100
5^{100}
5
100
.
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