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Search: id:A073142
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| A073142 |
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List of smallest solutions for some k of x = f^k(x), n <> f^j(n) for j < k, where f: m -> |m - reverse(m)|. |
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4
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OFFSET
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1,2
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COMMENT
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In the definition, j can be restricted to proper divisors of k. A073143 gives the corresponding values of k. A073144(n) gives the smallest m such that the 'Reverse and Subtract' trajectory of m leads to a(n). Presumably a(6) = 1186781188132188 with k = 17.
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EXAMPLE
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a(3) = 11436678 is the smallest solution of x = f^14(x) and there is no k such that x = f^k(x) has a smallest solution between a(2) = 2178 and a(3).
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CROSSREFS
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Cf. A072137, A072141, A072142, A072143, A072718, A072719, A073143, A073144.
Sequence in context: A008918 A035770 A107566 this_sequence A137874 A137875 A020425
Adjacent sequences: A073139 A073140 A073141 this_sequence A073143 A073144 A073145
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KEYWORD
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base,more,nonn
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AUTHOR
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Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Jul 17 2002
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EXTENSIONS
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Offset changed by N. J. A. Sloane (njas(AT)research.att.com), Dec 01 2007
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