OFFSET
1,1
LINKS
T. D. Noe, Table of n, a(n) for n = 1..1000
EXAMPLE
a(1) = 3 because 3 is the first number k whose trajectory goes above k.
MATHEMATICA
Collatz[n_] := NestWhileList[If[EvenQ[#], #/2, 3 # + 1] &, n, # > 1 &]; Select[Range[100], Max[Collatz[#]] > # &] (* T. D. Noe, Mar 01 2013 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Jayanta Basu, Mar 01 2013
STATUS
approved