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A243628 Odd numbers producing 30 even numbers in the Collatz iteration. 1
185, 187, 191, 541, 545, 551, 557, 561, 563, 575, 607, 1629, 1635, 1637, 1655, 1659, 1671, 1677, 1681, 1683, 1685, 1687, 1725, 1755, 1803, 1821, 1825, 1833, 2007, 2011, 4885, 4917, 4929, 4953, 4963, 4965, 4979, 5015, 5017, 5029, 5041, 5043, 5045, 5061, 5077, 5081, 5091, 5121 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

See row 30 of A199636.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..697

MATHEMATICA

Collatz[n_] := NestWhileList[If[EvenQ[#], #/2, 3 # + 1] &, n, # > 1 &]; t = {}; Do[If[Length[Select[Collatz[n], EvenQ]] == 30, AppendTo[t, n]], {n, 1, 100000, 2}]; t

CROSSREFS

Cf. A199636, A199817, A199818.

Sequence in context: A194614 A232915 A139265 * A262053 A157297 A156059

Adjacent sequences:  A243625 A243626 A243627 * A243629 A243630 A243631

KEYWORD

nonn,fini,less

AUTHOR

Vincenzo Librandi, Jun 08 2014

STATUS

approved

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Last modified October 20 07:20 EDT 2019. Contains 328252 sequences. (Running on oeis4.)