OFFSET
1,1
LINKS
T. D. Noe, Table of n, a(n) for n = 1..10000
MATHEMATICA
Collatz[n_] :=NestWhileList[If[EvenQ[#], #/2, 3*# + 1] &, n, # > 1 &]; t = {}; Do[If[Length[Select[Collatz[n], Mod[#, 4] == 1 &]] -Length[Select[Collatz[n], Mod[#, 4] == 3 &]] == 0, AppendTo[t, n]], {n, 1500}]; t
CROSSREFS
KEYWORD
nonn
AUTHOR
Jayanta Basu, Mar 23 2013
STATUS
approved