Some ergodic theorems over squarefree numbers and squarefull numbers
Acta Arithmetica
MSC: Primary 11K36; Secondary 11N37, 37A44
DOI: 10.4064/aa240909-18-6
Published online: 13 October 2025
Abstract
In 2022, Bergelson and Richter gave a new dynamical generalization of the prime number theorem by establishing an ergodic theorem along the number of prime factors of integers. They also showed that this generalization holds as well if the integers are restricted to be squarefree. In this paper, we present the concept of invariant averages under multiplications for arithmetic functions. Utilizing the properties of these invariant averages, we derive several ergodic theorems over squarefree numbers and squarefull numbers. These theorems have significant connections with the Erdős–Kac theorem, the Bergelson–Richter theorem, and the Loyd theorem.
