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2021 BMT
11
BMT 2021 General p11
BMT 2021 General p11
Source:
September 27, 2023
number theory
Problem Statement
Compute the number of sequences of five positive integers
a
1
,
.
.
.
,
a
5
a_1,..., a_5
a
1
,
...
,
a
5
where all
a
i
≤
5
a_i \le 5
a
i
≤
5
and the greatest common divisor of all five integers is
1
1
1
.
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