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Bundeswettbewerb Mathematik
2014 Bundeswettbewerb Mathematik
4
Terminating decimal expansion
Terminating decimal expansion
Source: BWM 2014 P4
June 9, 2014
modular arithmetic
number theory unsolved
number theory
Problem Statement
Find all postive integers
n
n
n
for which the number
4
n
+
1
n
(
2
n
−
1
)
\frac{4n+1}{n(2n-1)}
n
(
2
n
−
1
)
4
n
+
1
has a terminating decimal expansion.
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