MathDB
Problems
Contests
National and Regional Contests
PEN Problems
PEN J Problems
15
15
Part of
PEN J Problems
Problems
(1)
J 15
Source:
5/25/2007
Determine all positive integers for which
d
(
n
)
=
n
3
d(n)=\frac{n}{3}
d
(
n
)
=
3
n
holds.
Divisor Functions