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A073143
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Numbers k such that A073142(n) = f^k(A073142(n)), where f: m -> |m - reverse(m)|.
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3
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OFFSET
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1,2
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COMMENTS
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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?
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LINKS
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Table of n, a(n) for n=1..5.
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EXAMPLE
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a(3) = 14 since A073142(2) = 11436678 is the smallest solution of x = f^14(x).
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CROSSREFS
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Cf. A072137, A072141, A072142, A072143, A072718, A072719, A073142, A073144.
Sequence in context: A140578 A052213 A086263 * A066613 A074312 A061426
Adjacent sequences: A073140 A073141 A073142 * A073144 A073145 A073146
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KEYWORD
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base,more,nonn
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AUTHOR
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Klaus Brockhaus, Jul 17 2002
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EXTENSIONS
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Offset changed by N. J. A. Sloane, Dec 01 2007
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STATUS
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approved
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