Mathematics – Number Theory
Scientific paper
2011-03-18
Mathematics
Number Theory
Scientific paper
Here, we show that there is no positive integer $n$ such that the $n$th
Cullen number $C_n=n2^n+1$ has the property that it is composite but
$\phi(C_n)\mid C_n-1$.
Grau José María
Luca Florian
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