OFFSET
1,3
EXAMPLE
a(19)= 6 because 19 -> lambda(19)= 18 -> 9 -> lambda(9)= 6 -> 3 -> lambda(3)= 2 -> 1, hence the trajectory {19 -> 18 -> 9 -> 6 -> 3 -> 2 -> 1} with 6 iterations.
MATHEMATICA
f[n_]:=Module[{a=n, k=0}, While[a!=1, k++; If[EvenQ[a], a=a/2, a=CarmichaelLambda[a]]]; k]; Table[f[n], {n, 1, 150}]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Michel Lagneau, Jul 07 2015
STATUS
approved