Cullen Numbers with the Lehmer Property
arXiv:1103.3578
Abstract
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 $Ï(C_n)\mid C_n-1$.
arXiv:1103.3578
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 $Ï(C_n)\mid C_n-1$.