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Problems
Contests
National and Regional Contests
PEN Problems
PEN J Problems
12
12
Part of
PEN J Problems
Problems
(1)
J 12
Source:
5/25/2007
Determine all positive integers
n
n
n
such that
n
=
d
(
n
)
2
n={d(n)}^2
n
=
d
(
n
)
2
.
Divisor Functions