OFFSET
1,6
EXAMPLE
The a(60) = 9 factorizations:
(2*3*10), (2*5*6), (3*4*5),
(2*30), (3*20), (4*15), (5*12), (6*10),
(60).
MATHEMATICA
strfacs[n_]:=If[n<=1, {{}}, Join@@Table[Map[Prepend[#, d]&, Select[strfacs[n/d], Min@@#>d&]], {d, Rest[Divisors[n]]}]];
stableQ[u_, Q_]:=!Apply[Or, Outer[#1=!=#2&&Q[#1, #2]&, u, u, 1], {0, 1}];
Table[Length[Select[strfacs[n], stableQ[#, IntegerQ[Log[#1, #2]]&]&]], {n, 100}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Gus Wiseman, Jan 04 2019
STATUS
approved