Note on the Number of Finite Groups of a Given Order

A. R. Ashrafi, E. Haghi

Let $n$ be a positive integer and $G(n)$ denote the number of non-isomorphic finite groups of order $n$. It is well-known that $G(n)=1$ if and only if $(n,\varphi (n))=1$, where $ϕ(n)…