Journal of Integer Sequences, Vol. 7 (2004), Article 04.1.4

The Greatest Common Divisor of Two Recursive Functions


Jan-Christoph Schlage-Puchta and Jürgen Spilker
Mathematisches Institut
Eckerstr. 1
79104 Freiburg
Germany

Abstract: Let g, h be solutions of a linear recurrence relation of length 2. We show that under some mild assumptions the greatest common divisor of g(n) and h(n) is periodic as a function of n and compute its mean value.

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Received October 8 2003; revised version received January 27 2004. Published in Journal of Integer Sequences February 16 2004.

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