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A173807 (7*10^n-43)/9 for n>0. 1
3, 73, 773, 7773, 77773, 777773, 7777773, 77777773, 777777773, 7777777773, 77777777773, 777777777773, 7777777777773, 77777777777773, 777777777777773, 7777777777777773, 77777777777777773, 777777777777777773 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..100

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

FORMULA

a(n) = 10*a(n-1)+43 with n>0, a(0)=-4.

G.f.: x*(3+40*x)/((1-x)*(1-10*x)). - Vincenzo Librandi, Jul 05 2012

a(n) = 11*a(n-1) -10*a(n-2). - Vincenzo Librandi, Jul 05 2012

MATHEMATICA

CoefficientList[Series[(3+40*x)/((1-x)*(1-10*x)), {x, 0, 30}], x] (* Vincenzo Librandi, Jul 05 2012 *)

Table[FromDigits[PadLeft[{3}, n, 7]], {n, 20}] (* or *) NestList[10#+43&, 3, 20] (* Harvey P. Dale, Dec 05 2013 *)

PROG

(MAGMA)[(7*10^n-43)/9: n in [1..20]]; // Vincenzo Librandi, Jul 05 2012

CROSSREFS

Cf. A093165.

Sequence in context: A256144 A060883 A162601 * A093165 A189306 A012810

Adjacent sequences:  A173804 A173805 A173806 * A173808 A173809 A173810

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Feb 25 2010

STATUS

approved

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Last modified July 19 22:14 EDT 2019. Contains 325168 sequences. (Running on oeis4.)