Cullen Numbers with the Lehmer Property

preprint2011arXivOpen access

Abstract

Here, we show that there is no positive integer nn such that the nnth Cullen number Cn=n2n+1C_n=n2^n+1 has the property that it is composite but ϕ(Cn)∣Cn−1ϕ(C_n)\mid C_n-1.

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