#### Vol. 10, No. 1, 2017

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A generalization of Zeckendorf's theorem via circumscribed $m$-gons

### Robert Dorward, Pari L. Ford, Eva Fourakis, Pamela E. Harris, Steven J. Miller, Eyvindur Palsson and Hannah Paugh

Vol. 10 (2017), No. 1, 125–150
##### Abstract

Zeckendorf’s theorem states that every positive integer can be uniquely decomposed as a sum of nonconsecutive Fibonacci numbers, where the Fibonacci numbers satisfy ${F}_{1}=1$, ${F}_{2}=2$, and ${F}_{n}={F}_{n-1}+{F}_{n-2}$ for $n\ge 3$. The distribution of the number of summands in such a decomposition converges to a Gaussian, the gaps between summands converge to geometric decay, and the distribution of the longest gap is similar to that of the longest run of heads in a biased coin; these results also hold more generally, though for technical reasons previous work is needed to assume the coefficients in the recurrence relation are nonnegative and the first term is positive.

We extend these results by creating an infinite family of integer sequences called the $m$-gonal sequences arising from a geometric construction using circumscribed $m$-gons. They satisfy a recurrence where the first $m+1$ leading terms vanish, and thus cannot be handled by existing techniques. We provide a notion of a legal decomposition, and prove that the decompositions exist and are unique. We then examine the distribution of the number of summands used in the decompositions and prove that it displays Gaussian behavior. There is geometric decay in the distribution of gaps, both for gaps taken from all integers in an interval and almost surely in distribution for the individual gap measures associated to each integer in the interval. We end by proving that the distribution of the longest gap between summands is strongly concentrated about its mean, behaving similarly as in the longest run of heads in tosses of a coin.

##### Keywords
Zeckendorf decompositions, longest gap
##### Mathematical Subject Classification 2010
Primary: 11B39, 11B05
Secondary: 65Q30, 60B10