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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
OFFSET
1,1
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: A062060 A037986 A350141 * A039526 A108394 A288641
KEYWORD
nonn
AUTHOR
T. D. Noe, Oct 31 2011
STATUS
approved