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Problems
Contests
National and Regional Contests
PEN Problems
PEN A Problems
104
104
Part of
PEN A Problems
Problems
(1)
A 104
Source:
5/25/2007
A wobbly number is a positive integer whose
d
i
g
i
t
s
digits
d
i
g
i
t
s
in base
10
10
10
are alternatively non-zero and zero the units digit being non-zero. Determine all positive integers which do not divide any wobbly number.
Divisibility Theory