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PEN E Problems
7
E 7
E 7
Source:
May 25, 2007
modular arithmetic
Euler
pen
Problem Statement
Show that there exists a positive integer
k
k
k
such that k \cdot 2^{n} \plus{} 1 is composite for all
n
∈
N
0
n \in \mathbb{N}_{0}
n
∈
N
0
.
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