@article{hrj:5115, title = {A note on some congruences involving arithmetic functions}, author = {József Sándor}, url = {https://hrj.episciences.org/5115}, doi = {10.46298/hrj.2019.5115}, journal = {Hardy-Ramanujan Journal}, issn = {2804-7370}, volume = {}, year = {2019}, month = {Jan}, keywords = {Euler's totient, Dedekind's arithmetical function, number of divisors, primality, congruences 2010 Mathematics Subject Classification 11A25, 11A07, 11D45, 11N05, [MATH]Mathematics [math], [MATH.MATH-NT]Mathematics [math]/Number Theory [math.NT]}, language = {English}, }