A073143 Numbers k such that A073142(n) = f^k(A073142(n)), where f: m -> |m - reverse(m)|.

1, 2, 14, 22, 12

Offset

1,2

Comments

Presumably a(6) = 17. a(n) is the length of the periodic part (cf. A072137) of the trajectory of A073142(n). Question: Does every k > 0 appear in this sequence?

Links

Table of n, a(n) for n=1..5.

Example

a(3) = 14 since A073142(2) = 11436678 is the smallest solution of x = f^14(x).

Crossrefs

Cf. A072137, A072141, A072142, A072143, A072718, A072719, A073142, A073144.

Sequence in context: A086263 A355709 A335071 * A066613 A074312 A061426

Adjacent sequences: A073140 A073141 A073142 * A073144 A073145 A073146

Keyword

base,more,nonn

Author

Klaus Brockhaus, Jul 17 2002

Extensions

Offset changed by N. J. A. Sloane, Dec 01 2007

Status

approved