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arxiv: math/0703925 · v1 · pith:HRI6EX3Gnew · submitted 2007-03-30 · 🧮 math.NT

Primes in a prescribed arithmetic progression dividing the sequence a^k+b^k

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keywords densitydividingprimessomearithmeticclaimscomputeconsidering
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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 a^k+b^k 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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