A161021 Collatz (or 3x+1) trajectory starting at 703.

703, 2110, 1055, 3166, 1583, 4750, 2375, 7126, 3563, 10690, 5345, 16036, 8018, 4009, 12028, 6014, 3007, 9022, 4511, 13534, 6767, 20302, 10151, 30454, 15227, 45682, 22841, 68524, 34262, 17131, 51394, 25697, 77092, 38546, 19273, 57820, 28910

Offset: 0

Author

Reinhard Zumkeller, Jun 03 2009

Keywords

• nonn
• easy

Comments

703 = A060412(5); a(A006577(703)) = a(170) = 1;

a(n) = A008884(n-59) for n with 162 <= n <= 170;

a(n) = A161022(n+53) for n with 155 <= n <= 170;

a(n) = A161023(n+153) for n with 144 <= n <= 170.

Links

• R. Zumkeller, Table of n, a(n) for n = 0..170
• Index entries for sequences related to 3x+1 (or Collatz) problem
• Index entries for linear recurrences with constant coefficients, signature (0,0,1).

Programs

Mathematica

NestList[If[EvenQ[#],#/2,3#+1]&,703,40] (* Harvey P. Dale, Nov 27 2011 *)

Extensions

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