OFFSET
1,3
LINKS
T. D. Noe, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = A222597(n) - 1.
EXAMPLE
For n=3, the Collatz trajectory is 3, 10, 5, 16, 8, 4, 2, 1 and hence a(3)=6.
MATHEMATICA
Collatz[n_] := NestWhileList[If[EvenQ[#], #/2, 3 # + 1] &, n, # > 1 &]; Table[Length[Select[Collatz[n], # >= n &]], {n, 100}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Jayanta Basu, Mar 01 2013
STATUS
approved