A curious congruence modulo prime powers

作者:Wang, Liuquan; Cai, Tianxin*
来源:Journal of Number Theory, 2014, 144: 15-24.
DOI:10.1016/j.jnt.2014.04.004

摘要

Zhao established a curious congruence, i.e., for any prime p >= 3, @@@ [GRAPHICS] @@@ In this note we prove that for any prime p >= 3 and positive integer r, @@@ [GRAPHICS] @@@ where P-n denotes the set of positive integers which are prime to n.