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arXiv · 2610.28685

An Asymptotic for Non-Wieferich Numbers

Casia Siegel
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Abstract

A cyclic number is a positive integer $n$ such that $\gcd(n, φ(n)) = 1$. Erdős showed that the number of cyclic numbers up to $x$, $C(x)$, has $C(x) \sim e^{-γ}x/\log_3(x)$ asymptotically as $x$ tends to infinity. We define Wieferich numbers to be odd, positive integers $n$ such that $(n, (2^{\ell(n)}-1)/n) > 1$, where $\ell(n)$ is the smallest positive integer with $2^{\ell(n)} \equiv 1 \mod n$. Franco and Pomerance showed that non-Wieferich numbers have density zero among the odd integers. We show that the counting function of $n \leq x$ in the symmetric difference of non-Wieferich numbers and cyclic numbers is $O(x/(\log_3(x))^2)$, under a mild assumption on the counting function of Wieferich primes.

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Casia Siegel. 2026-10-19. An Asymptotic for Non-Wieferich Numbers. https://arxiv.org/abs/2610.28685

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