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A199685 a(n) = 5*10^n+1. 6
6, 51, 501, 5001, 50001, 500001, 5000001, 50000001, 500000001, 5000000001, 50000000001, 500000000001, 5000000000001, 50000000000001, 500000000000001, 5000000000000001, 50000000000000001, 500000000000000001, 5000000000000000001 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

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

FORMULA

a(n) = 3*A126109(n).

a(n) = 10*a(n-1)-9.

a(n) = 11*a(n-1)-10*a(n-2).

G.f.: 3*(2-5*x)/((1-x)*(1-10*x)).

MATHEMATICA

LinearRecurrence[{11, -10}, {6, 51}, 30] (* Harvey P. Dale, Apr 06 2013 *)

PROG

(MAGMA) [5*10^n+1: n in [0..30]];

(PARI) a(n)=5*10^n+1 \\ Charles R Greathouse IV, Oct 16 2015

CROSSREFS

Sequence in context: A292840 A202754 A180901 * A225615 A002295 A215159

Adjacent sequences:  A199682 A199683 A199684 * A199686 A199687 A199688

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Nov 09 2011

STATUS

approved

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Last modified July 26 17:37 EDT 2021. Contains 346294 sequences. (Running on oeis4.)