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National and Regional Contests
PEN Problems
PEN J Problems
14
14
Part of
PEN J Problems
Problems
(1)
J 14
Source:
5/25/2007
Find all positive integers
n
n
n
such that
d
(
n
)
3
=
4
n
{d(n)}^{3} =4n
d
(
n
)
3
=
4
n
.
Divisor Functions
pen
imo shortlist 2001