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A177107
3*(10^n-7).
0
9, 279, 2979, 29979, 299979, 2999979, 29999979, 299999979, 2999999979, 29999999979, 299999999979, 2999999999979, 29999999999979, 299999999999979, 2999999999999979, 29999999999999979, 299999999999999979
OFFSET
1,1
FORMULA
G.f 9*x*(1+20*x) / ( (10*x-1)*(x-1) ). a(n) = 9*A033175(n-1). - R. J. Mathar, Jan 06 2011
MATHEMATICA
3(10^Range[20]-7) (* or *) LinearRecurrence[{11, -10}, {9, 279}, 20] (* Harvey P. Dale, Mar 20 2020 *)
CROSSREFS
Sequence in context: A295898 A330604 A336259 * A346187 A012234 A012141
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 15 2010
STATUS
approved