A161022 - OEIS

A161022

Collatz (or 3x+1) trajectory starting at 10087.

10087, 30262, 15131, 45394, 22697, 68092, 34046, 17023, 51070, 25535, 76606, 38303, 114910, 57455, 172366, 86183, 258550, 129275, 387826, 193913, 581740, 290870, 145435, 436306, 218153, 654460, 327230, 163615, 490846, 245423, 736270

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OFFSET

0,1

COMMENTS

10087 = A060412(6); a(A006577(10087)) = a(223) = 1;

a(n)=A161021(n-53)=A161023(n+100) for n with 208<=n<=228.

At step 221 becomes periodic: 4 2 1 4 2 1 4 2 1 ... - N. J. A. Sloane, Jul 27 2019

LINKS

R. Zumkeller, Table of n, a(n) for n = 0..223

Index entries for sequences related to 3x+1 (or Collatz) problem

Index entries for linear recurrences with constant coefficients, signature (0,0,1).

MATHEMATICA

NestList[If[EvenQ[#], #/2, 3#+1]&, 10087, 30] (* Harvey P. Dale, Jul 25 2023 *)

CROSSREFS

A008884.

Sequence in context: A230033 A252052 A083965 * A293686 A267057 A213182

Adjacent sequences: A161019 A161020 A161021 * A161023 A161024 A161025

KEYWORD

nonn,easy

AUTHOR

Reinhard Zumkeller, Jun 03 2009

EXTENSIONS

Edited by N. J. A. Sloane, Jul 27 2019

STATUS

approved