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 A198592 Odd numbers producing 9 odd numbers in the Collatz iteration. 1

%I

%S 33,65,67,131,133,261,269,273,289,525,529,533,547,555,571,577,579,583,

%T 633,635,1045,1059,1077,1093,1099,1111,1143,1155,1157,1167,1177,1267,

%U 1271,1273,2101,2117,2123,2133,2161,2189,2199,2221,2285,2309,2317,2321,2333

%N Odd numbers producing 9 odd numbers in the Collatz iteration.

%H T. D. Noe, <a href="/A198592/b198592.txt">Table of n, a(n) for n = 1..1000</a>

%t Collatz[n_] := NestWhileList[If[EvenQ[#], #/2, 3 # + 1] &, n, # > 1 &]; t = {}; Do[If[Length[Select[Collatz[n], OddQ]] == 9, AppendTo[t, n]], {n, 1, 10000, 2}]; t

%Y Cf. A198584.

%K nonn

%O 1,1

%A _T. D. Noe_, Oct 31 2011

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