Moree, Pieter Max Planck Institute for Mathematics, Max Planck Society;
https://doi.org/10.1017/S0004972719000443 (Publisher version)
arXiv:1901.02650.pdf (Preprint), 140KB
Moree, P., & Sha, M. (2019). Primes in arithmetic progressions and nonprimitive roots. Bulletin of the Australian Mathematical Society, 100(3), 388-394. doi:10.1017/S0004972719000443.