"Choix de Bruxelles": A New Operation on Positive Integers

Eric Angelini,Lars Blomberg, Charlie Neder,Remy Sigrist,N. J. A. Sloane

FIBONACCI QUARTERLY（2019）

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摘要

The "Choix de Bruxelles" operation replaces a positive integer n by any of the numbers that can be obtained by halving or doubling a substring of the decimal representation of n. For example, 16 can become any of 16, 26, 13, 112, 8, or 32. We investigate the properties of this interesting operation and its iterates.

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