OFFSET
1,1
MATHEMATICA
Collatz[n_]:=NestWhileList[If[EvenQ[#], #/2, 3 #+1]&, n, #>1&]; t={}; Do[If[Length[Select[Collatz[n], EvenQ]] == 10, AppendTo[t, n]], {n, 1, 100000, 2}]; t
CROSSREFS
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Nov 12 2011
STATUS
approved