OFFSET
1,1
LINKS
EXAMPLE
a(1) is 3 because its Collatz sequence has eight steps: 3, 10, 5, 16, 8, 4, 2, 1.
MATHEMATICA
Select[Range[1000], Length[Collatz[#]] > #+1 &] (* T. D. Noe, Aug 20 2013 *)
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Gonzalo Ciruelos, Aug 02 2013
STATUS
approved