On the Oppenheim's "factorisatio numerorum" function
  Let $f(n)$ denote the number of distinct unordered factorisations of the natural number $n$ into factors larger than 1.In this paper, we address some aspects of the function $f(n)$. 
Florian Luca, Anirban Mukhopadhyay and Kotyada Srinivas