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A198593 Odd numbers producing 10 odd numbers in the Collatz iteration. 2
43, 87, 89, 173, 177, 179, 349, 355, 357, 385, 423, 693, 705, 709, 717, 729, 761, 769, 771, 777, 847, 1393, 1397, 1411, 1415, 1421, 1429, 1457, 1459, 1465, 1481, 1523, 1539, 1541, 1547, 1555, 1569, 1689, 1693, 1697, 2773, 2787, 2801, 2821, 2831, 2837, 2869 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

T. D. Noe, Table of n, a(n) for n = 1..1000

MATHEMATICA

Collatz[n_] := NestWhileList[If[EvenQ[#], #/2, 3 # + 1] &, n, # > 1 &]; t = {}; Do[If[Length[Select[Collatz[n], OddQ]] == 10, AppendTo[t, n]], {n, 1, 10000, 2}]; t

CROSSREFS

Cf. A198584.

Sequence in context: A065874 A062060 A037986 * A039526 A108394 A288641

Adjacent sequences:  A198590 A198591 A198592 * A198594 A198595 A198596

KEYWORD

nonn

AUTHOR

T. D. Noe, Oct 31 2011

STATUS

approved

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Last modified June 18 18:17 EDT 2021. Contains 345120 sequences. (Running on oeis4.)