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National and Regional Contests
Vietnam Contests
Vietnam National Olympiad
1970 Vietnam National Olympiad
2
Divisors
Divisors
Source:
July 18, 2016
Problem Statement
Let
N
=
1890
∗
1930
∗
1970
N=1890*1930*1970
N
=
1890
∗
1930
∗
1970
, find the number of divisors of N which are not divisors of
45
45
45
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