OFFSET
1,2
COMMENTS
LINKS
EXAMPLE
The stable divisors of 60 are {1, 2, 3, 4, 5, 15}, so a(60) = 15.
MATHEMATICA
stableQ[u_, Q_]:=!Apply[Or, Outer[#1=!=#2&&Q[#1, #2]&, u, u, 1], {0, 1}];
Table[Max[Select[Divisors[n], stableQ[PrimePi/@First/@FactorInteger[#], Divisible]&]], {n, 100}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Gus Wiseman, Sep 15 2019
STATUS
approved