A161023 Collatz trajectory starting at 35655.

35655, 106966, 53483, 160450, 80225, 240676, 120338, 60169, 180508, 90254, 45127, 135382, 67691, 203074, 101537, 304612, 152306, 76153, 228460, 114230, 57115, 171346, 85673, 257020, 128510, 64255, 192766, 96383, 289150, 144575, 433726

Offset: 0

Author

Reinhard Zumkeller, Jun 03 2009

Keywords

• nonn
• look
• easy

Comments

35655 = A060412(7); a(A006577(35655)) = a(323) = 1.

a(n) = A161021(n-153) for n with 297 <= n <= 323;

a(n) = A161022(n-100) for n with 308 <= n <= 323.

At step 321 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..323
• Index entries for sequences related to 3x+1 (or Collatz) problem
• Index entries for linear recurrences with constant coefficients, signature (0,0,1).

Crossrefs

Cf. A008884.

Programs

Mathematica

NestWhileList[If[EvenQ[#],#/2,3#+1]&,35655,#>1&] (* Harvey P. Dale, Apr 28 2016 *)

Extensions

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