“…≡ 0 (mod p) for (p − 1)/2 < k p − 1. Nowadays all kinds of generalizations of (1.1) for p ≡ 3 (mod 4) are given by different authors [2,10,12,13,17,18,21,23,24]. For instance, Liu [17] proved that, for any prime p ≡ 3 (mod 4) and positive integer m,…”