OFFSET
1,5
LINKS
MATHEMATICA
nn=100;
facsusing[s_, n_]:=If[n<=1, {{}}, Join@@Table[Map[Prepend[#, d]&, Select[facsusing[Select[s, Divisible[n/d, #]&], n/d], Min@@#>=d&]], {d, Select[s, Divisible[n, #]&]}]];
y=Select[Range[nn], SquareFreeQ];
Table[Length[facsusing[Rest[y], n]], {n, y}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Gus Wiseman, Sep 15 2019
STATUS
approved