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A175775 7*(10^n-3). 0
49, 679, 6979, 69979, 699979, 6999979, 69999979, 699999979, 6999999979, 69999999979, 699999999979, 6999999999979, 69999999999979, 699999999999979, 6999999999999979, 69999999999999979, 699999999999999979 (list; graph; refs; listen; history; text; internal format)
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

a(1)=49, a(2)=679, a(n)=11*a(n-1)-10*a(n-2). - Harvey P. Dale, Jun 21 2011

G.f.: x*(7*(7+20*x))/(1-11*x+10*x^2). - Harvey P. Dale, Jun 21 2011

MATHEMATICA

7(10^Range[20]-3) (* or *) LinearRecurrence[{11, -10}, {49, 679}, 20] (* Harvey P. Dale, Jun 21 2011 *)

CROSSREFS

Sequence in context: A263704 A166832 A299711 * A215117 A289992 A278284

Adjacent sequences:  A175772 A175773 A175774 * A175776 A175777 A175778

KEYWORD

nonn

AUTHOR

Vincenzo Librandi, Nov 15 2010

STATUS

approved

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Last modified June 18 18:52 EDT 2019. Contains 324215 sequences. (Running on oeis4.)