A199817 - OEIS

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A199817

Odd numbers producing 10 even numbers in the Collatz iteration.

11, 35, 113, 341

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..4.

MATHEMATICA

Collatz[n_]:=NestWhileList[If[EvenQ[#], #/2, 3 #+1]&, n, #>1&]; t={}; Do[If[Length[Select[Collatz[n], EvenQ]] == 10, AppendTo[t, n]], {n, 1, 100000, 2}]; t

CROSSREFS

Cf. A131450.

Cf. A199636 (row 10).

Sequence in context: A297539 A323691 A368743 * A216034 A224790 A098116

Adjacent sequences: A199814 A199815 A199816 * A199818 A199819 A199820

KEYWORD

nonn

AUTHOR

Vincenzo Librandi, Nov 12 2011

STATUS

approved