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On cyclic numbers and an extension of Midy's theorem

Juan B. Gil, Michael D. Weiner

math.NTarXiv:math/0605347

Abstract

In this note we consider fractions of the form 1/m and their floating-point representation in various arithmetic bases. For instance, what is 1/7 in base 2005? And, what about 1/4? We give a simple algorithm to answer these questions. In addition, we discuss an extension of Midy's theorem whose proof relies on elementary modular arithmetic.

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