Abstract:
Li, Hu and Kim [1] proved the following generalization of the Menon-Sury identity by using the filtrations of the ring Z
nand its unit group Z
*n:

,
where
φ is Euler’s Totient function,

, and
χ is a Dirichlet character mod n with conductor d. In this paper, we re-prove the above identity based the orthogonality of Dirichlet characters and elementary calculations [2].