A177098 6*(10^n-7)

18, 558, 5958, 59958, 599958, 5999958, 59999958, 599999958, 5999999958, 59999999958, 599999999958, 5999999999958, 59999999999958, 599999999999958, 5999999999999958, 59999999999999958, 599999999999999958

Offset

1,1

Links

Table of n, a(n) for n=1..17.

Index entries for linear recurrences with constant coefficients, signature (11,-10).

Formula

G.f. 18*x*(1+20*x) / ( (10*x-1)*(x-1) ). - R. J. Mathar, Aug 24 2011

a(n) = 18*A033175(n-1). - R. J. Mathar, Aug 24 2011

Mathematica

6(10^Range[20]-7)  (* Harvey P. Dale, Mar 22 2011 *)

Crossrefs

Sequence in context: A334179 A183498 A254381 * A375050 A133401 A211708

Adjacent sequences: A177095 A177096 A177097 * A177099 A177100 A177101

Keyword

nonn,easy

Author

Vincenzo Librandi

Status

approved