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A006050
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Smallest number of additive persistence n.
(Formerly M4683)
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7
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OFFSET
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0,2
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REFERENCES
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H. J. Hindin, The additive persistence of a number, J. Rec. Math., 7 (No. 2, 1974), 134-135.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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Table of n, a(n) for n=0..4.
N. J. A. Sloane, The persistence of a number, J. Recreational Math., 6 (1973), 97-98.
Eric Weisstein's World of Mathematics, Additive Persistence.
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FORMULA
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For n>1 a(n)=2*10^((a(n-1)-1)/9)-1.
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MATHEMATICA
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lst = {0, 10}; Do[AppendTo[lst, 2*10^((lst[[-1]] - 1)/9) - 1], {3}]; lst (* Arkadiusz Wesolowski, Oct 17 2012 *)
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CROSSREFS
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Cf. A003001, A045646.
Sequence in context: A121725 A110368 * A045646 A212594 A023916 A172503
Adjacent sequences: A006047 A006048 A006049 * A006051 A006052 A006053
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KEYWORD
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nonn,base,nice
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AUTHOR
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N. J. A. Sloane.
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EXTENSIONS
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Next term is 1 followed by 2222222222222222222222 9s.
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STATUS
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approved
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