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arXiv · 2011.13068

Fibonacci along even powers is (almost) realizable

Patrick Moss·Tom Ward
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Abstract

An integer sequence is called realizable if it is the count of periodic points of some map. The Fibonacci sequence $(F_n)$ does not have this property, and the Fibonacci sequence sampled along the squares $(F_{n^2})$ also does not have this property. We prove that this is an arithmetic phenomenon related to the discriminant of the Fibonacci sequence, by showing that the sequence $(5F_{n^2})$ is realizable. More generally, we show that $(F_{n^{2k-1}})$ is not realizable in a particularly strong sense while $(5F_{n^{2k}})$ is realizable, for any $k\ge1$.

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Patrick Moss, Tom Ward. 2020-11-26. Fibonacci along even powers is (almost) realizable. https://arxiv.org/abs/2011.13068

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