A198588 - OEIS

A198588

Odd numbers producing 5 odd numbers in the Collatz iteration.

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

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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 A354589 A068231

Adjacent sequences: A198585 A198586 A198587 * A198589 A198590 A198591

KEYWORD

nonn

AUTHOR

T. D. Noe, Oct 31 2011

STATUS

approved