A072147 Records for the length of the preperiodic part of the 'Reverse and Subtract' trajectories.

0, 1, 2, 6, 7, 12, 13, 18, 25, 40, 45, 47, 48, 49, 55, 56, 60, 62, 63, 64, 66, 71, 72, 75, 78, 81, 106, 108, 111, 112, 114, 115, 119, 121, 122, 130, 132, 133, 135, 147, 148, 149, 151, 156

Offset: 1

Author

Klaus Brockhaus, Jun 24 2002

Keywords

• base
• more
• nonn

Comments

Successive maxima in sequence A072137. A072146 gives the corresponding starting points. - This sequence is a weak analog of A065199, which uses 'Reverse and Add'.

Examples

			6 is a record, since the preperiodic part of the trajectory of 13 has length 6 and for k < 13 the preperiodic part has a smaller length (at most 2).
		

Crossrefs

Cf. A072137, A072146, A065199.

Extensions

a(18) inserted, a(25) corrected, a(29) through a(44) added by Alexander Pesch (alex-physics(AT)gmx.net), May 29 2007

Edited by N. J. A. Sloane, Dec 01 2007