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A073143
Numbers k such that A073142(n) = f^k(A073142(n)), where f: m -> |m - reverse(m)|.
3
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?
EXAMPLE
a(3) = 14 since A073142(2) = 11436678 is the smallest solution of x = f^14(x).
KEYWORD
base,more,nonn
AUTHOR
Klaus Brockhaus, Jul 17 2002
EXTENSIONS
Offset changed by N. J. A. Sloane, Dec 01 2007
STATUS
approved