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The Maximum Length for Ducci Sequences on $\mathbb{}Z_m^n$ when $n$ is Even
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abstract
Let $D: \mathbb{Z}_m^n \to \mathbb{Z}_m^n$ be defined so \[D(x_1, x_2, ..., x_n)=(x_1+x_2 \; \text{mod} \; m, x_2+x_3 \; \text{mod} \; m, ..., x_n+x_1 \; \text{mod} \; m).\] $D$ is known as the Ducci function and for $\mathbf{u} \in \mathbb{Z}_m^n$, $\{D^{\alpha}(\mathbf{u})\}_{\alpha=0}^{\infty}$ is the Ducci sequence of $\mathbf{u}$. Every Ducci sequence enters a cycle because $\mathbb{Z}_m^n$ is finite. In this paper, we aim to establish an upper bound for how long it will take for a Ducci sequence in $\mathbb{Z}_m^n$ to enter its cycle when $n$ is even.
Forward citations
Cited by 2 Pith papers
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Values of Ducci Periods for Sequences on $\mathbb{Z}_m^n$
For n=m=p prime, the only Ducci periods are 1, the order of 2 modulo p (for constant tuples), and p times that order; for n=3 and m odd prime, all non-exceptional tuples realize the maximum period.
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Examining $H$-Closed Ducci Sequences on $\mathbb{Z}_m^n$
The authors prove that for several families of moduli, cyclically shifting the starting tuple does not change its Ducci cycle, and they tabulate many more such cases.
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