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A292635
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Numbers n such that 5 applications of "Reverse and Subtract" lead to n, whereas fewer than 5 applications do not lead to n.
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9
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10591266563195008940873343680499, 27547681086656717245231891334328, 54795638726597554520436127340244, 68723845538328853127615446167114, 88817367774609971118263222539002
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OFFSET
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1,1
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COMMENTS
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There are 5 thirty-two-digit terms in the sequence. Further sequences can be obtained by inserting at the center of these terms any number of 9's and by concatenating a term any number of times with itself and inserting an equal number of 0's at all junctures.
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LINKS
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FORMULA
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n = f^5(n), n <> f^k(n) for k < 5, where f: x -> |x - reverse(x)|.
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EXAMPLE
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10591266563195008940873343680499 -> 88817367774609971118263222539002 -> 68723845538328853127615446167114 -> 27547681086656717245231891334328 -> 54795638726597554520436127340244 -> 10591266563195008940873343680499
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CROSSREFS
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Cf. A072142, A072143, A072718, A072719, A215669, A292634, A292846, A292856, A292857, A292858, A292859.
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KEYWORD
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nonn,base,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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