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A198588
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Odd numbers producing 5 odd numbers in the Collatz iteration.
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1
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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
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1,1
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LINKS
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MATHEMATICA
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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
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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