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

1,3

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'.

Links

Table of n, a(n) for n=1..44.

Example

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.

Sequence in context: A217575 A172154 A293531 * A190121 A105329 A124319

Adjacent sequences: A072144 A072145 A072146 * A072148 A072149 A072150

Keyword

base,more,nonn

Author

Klaus Brockhaus, Jun 24 2002

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

Status

approved