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A045646 Alternative version of A006050. 5
1, 10, 19, 199, 19999999999999999999999 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
COMMENTS
This is also the smallest n such that digit sum of n = previous term. - Dominick Cancilla, Aug 09 2010
REFERENCES
H. J. Hindin, The additive persistence of a number, J. Rec. Math., 7 (No. 2, 1974), 134-135.
LINKS
N. J. A. Sloane, The persistence of a number, J. Recreational Math., 6 (1973), 97-98.
FORMULA
For n > 1, a(n) = 2*10^((a(n-1)-1)/9) - 1.
MATHEMATICA
Join[{1}, NestList[2*10^((#-1)/9)-1&, 10, 3]] (* Harvey P. Dale, Sep 20 2011 *)
CROSSREFS
Sequence in context: A121725 A110368 A006050 * A334137 A212594 A255529
KEYWORD
nonn,base,nice
AUTHOR
EXTENSIONS
Next term is 1 followed by 2222222222222222222222 9s.
STATUS
approved

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Last modified March 28 16:58 EDT 2024. Contains 371254 sequences. (Running on oeis4.)