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A198588 Odd numbers producing 5 odd numbers in the Collatz iteration. 1
11, 23, 45, 93, 181, 201, 369, 373, 401, 403, 725, 739, 753, 803, 805, 1477, 1493, 1507, 1605, 1611, 1613, 2901, 2957, 3013, 3033, 3213, 3221, 3223, 5909, 5973, 6029, 6065, 6067, 6421, 6445, 6453, 6465, 11605, 11829, 12053, 12131, 12133, 12853, 12885, 12893 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi and T. D. Noe, Table of n, a(n) for n = 1..900 (terms 1 to 128 from Vincenzo Librandi)

MATHEMATICA

Collatz[n_] := NestWhileList[If[EvenQ[#], #/2, 3 # + 1] &, n, # > 1 &]; t = {}; Do[If[Length[Select[Collatz[n], OddQ]] == 5, AppendTo[t, n]], {n, 1, 20000, 2}]; t

CROSSREFS

Cf. A198584.

Sequence in context: A146451 A195043 A029468 * A334829 A068231 A185005

Adjacent sequences:  A198585 A198586 A198587 * A198589 A198590 A198591

KEYWORD

nonn

AUTHOR

T. D. Noe, Oct 31 2011

STATUS

approved

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Last modified August 5 01:51 EDT 2021. Contains 346456 sequences. (Running on oeis4.)