Primes in a prescribed arithmetic progression dividing the sequence ak+bk
Abstract
Given positive integers a,b,c and d such that c and d are coprime we show that the primes p=c(mod d)dividing ak+bk for some k>=1 have a natural density and explicitly compute this density. We demonstrate our results by considering some claims of Fermat that he made in a 1641 letter to Mersenne.
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