OFFSET
1,3
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
FORMULA
The smallest x such that A116550^x(n) = 1, where the operation Op^x denotes x nestings of the operator Op.
EXAMPLE
MAPLE
MATHEMATICA
A116550[1] = 1; A116550[n_] := With[{pp = Power @@@ FactorInteger[n]}, Count[Range[n], m_ /; Intersection[pp, Power @@@ FactorInteger[m]] == {}]]; a[n_] := a[n] = If[n == 1, 0, 1 + a[A116550[n]]]; Table[a[n], {n, 1, 80}] (* Jean-François Alcover, Dec 16 2013 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
R. J. Mathar, May 05 2013
STATUS
approved