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14
J 14
J 14
Source:
May 25, 2007
Divisor Functions
pen
imo shortlist 2001
Problem Statement
Find all positive integers
n
n
n
such that
d
(
n
)
3
=
4
n
{d(n)}^{3} =4n
d
(
n
)
3
=
4
n
.
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