Cullen Numbers with the Lehmer Property
classification
🧮 math.NT
keywords
cullenpropertycompositehereintegerlehmernumbernumbers
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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 $\phi(C_n)\mid C_n-1$.
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