Non-standard Zeckendorf decompositions; or, Tribonacci within Fibonacci

We study B(n;k), the number of ways of writing n as a sum or difference of the first k Fibonacci numbers. We show that B(0;k) satisfies the Tribonacci-like recurrence B(0;k+1)=B(0;k)+B(0;k−1)+B(0;k−2) and that B(n;k) satisfies a modified version of this recurrence.

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Publication Details

Journal
The Fibonacci Quarterly
Published
2026-08-03
DOI
https://doi.org/10.1080/00150517.2026.2676035
Primary Topic
Advanced Mathematical Theories and Applications
Type
article
Field-Weighted Citation Impact
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article

Non-standard Zeckendorf decompositions; or, Tribonacci within Fibonacci

Katie Anders, Joseph Vandehey, Madeline L. Dawsey
The Fibonacci Quarterly
Advanced Mathematical Theories and Applications
article

Non-standard Zeckendorf decompositions; or, Tribonacci within Fibonacci

Katie Anders, Joseph Vandehey, Madeline L. Dawsey
article en

Abstract

We study B(n;k), the number of ways of writing n as a sum or difference of the first k Fibonacci numbers. We show that B(0;k) satisfies the Tribonacci-like recurrence B(0;k+1)=B(0;k)+B(0;k−1)+B(0;k−2) and that B(n;k) satisfies a modified version of this recurrence.

The Fibonacci Quarterly
The University of Texas at Tyler (US)
Quality Education
Openalex Percentile: Top 9%
Advanced Mathematical Theories and Applications
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Non-standard Zeckendorf decompositions; or, Tribonacci within Fibonacci — Katie Anders, Joseph Vandehey, et al. · The Fibonacci Quarterly (2026) | TGRS Research Map | TGRS