English

The Hurt-Sada Array and Zeckendorf Representations

Number Theory 2025-01-16 v1 Discrete Mathematics Formal Languages and Automata Theory Combinatorics

Abstract

Wesley Ivan Hurt and Ali Sada both independently proposed studying an infinite array where the 00'th row consists of the non-negative integers 0,1,2,0,1,2,\ldots in increasing order. Thereafter the nn'th row is formed from the (n1)(n-1)'th row by "jumping" the single entry nn by nn places to the right. Sada also defined a sequence s(n)s(n) defined to be the first number that nn jumps over. In this note I show how the Hurt-Sada array and Sada's sequence are intimately connected with the golden ratio φ\varphi and Zeckendorf representation. I also consider a number of related sequences.

Cite

@article{arxiv.2501.08823,
  title  = {The Hurt-Sada Array and Zeckendorf Representations},
  author = {Jeffrey Shallit},
  journal= {arXiv preprint arXiv:2501.08823},
  year   = {2025}
}
R2 v1 2026-06-28T21:07:12.690Z