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A198591 Odd numbers producing 8 odd numbers in the Collatz iteration. 1
25, 49, 51, 99, 101, 197, 205, 217, 397, 405, 433, 435, 441, 475, 789, 821, 833, 857, 867, 869, 875, 883, 951, 953, 955, 1589, 1621, 1649, 1667, 1713, 1715, 1733, 1741, 1751, 1765, 1785, 1901, 1907, 1911, 3157, 3185, 3285, 3299, 3333, 3427, 3429, 3469, 3477 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1938

MATHEMATICA

Collatz[n_] := NestWhileList[If[EvenQ[#], #/2, 3 # + 1] &, n, # > 1 &]; t = {}; Do[If[Length[Select[Collatz[n], OddQ]] == 8, AppendTo[t, n]], {n, 1, 10000, 2}]; t

CROSSREFS

Cf. A198584.

Sequence in context: A004936 A062058 A273510 * A069063 A064937 A245272

Adjacent sequences:  A198588 A198589 A198590 * A198592 A198593 A198594

KEYWORD

nonn

AUTHOR

T. D. Noe, Oct 31 2011

STATUS

approved

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Last modified June 17 23:41 EDT 2021. Contains 345088 sequences. (Running on oeis4.)