Asboei, A.K.; Amiri, S.S.; Iranmanesh, A.
(Algebra and Discrete Mathematics, 2014)
Let G be a finite group and let πe(G) be the set of element orders of G. Let k ∈ πe(G) and let mk be the number of elements of order k in G. Set nse(G):={mk|k ∈ πe(G)}. In this paper, we show that if n= r, r + 1, r + 2, r ...