ZAHRA, A.; DJAMEL, B.; ABDELMADJID, B. Solutions of the equation d (kn) = ϕ (ϕ (n)). Jordan Journal of Mathematics and Statistics, [S. l.], v. 17, n. 3, 2024. Disponível em: https://jjms.yu.edu.jo/index.php/jjms/article/view/437. Acesso em: 21 nov. 2024.