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Primitive divisors of Lucas and Lehmer sequences, II

Paul M. Voutier (1996)

Journal de théorie des nombres de Bordeaux

Let α and β are conjugate complex algebraic integers which generate Lucas or Lehmer sequences. We present an algorithm to search for elements of such sequences which have no primitive divisors. We use this algorithm to prove that for all α and β with h ( β / α ) 4 , the n -th element of these sequences has a primitive divisor for n > 30 . In the course of proving this result, we give an improvement of a result of Stewart concerning more general sequences.

Products and quotients of numbers with small partial quotients

Stephen Astels (2002)

Journal de théorie des nombres de Bordeaux

For any positive integer m let F ( m ) denote the set of numbers with all partial quotients (except possibly the first) not exceeding m . In this paper we characterize most products and quotients of sets of the form F ( m ) .

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