login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A173736 (10^n+35)/9 for n>0. 1
5, 15, 115, 1115, 11115, 111115, 1111115, 11111115, 111111115, 1111111115, 11111111115, 111111111115, 1111111111115, 11111111111115, 111111111111115, 1111111111111115, 11111111111111115, 111111111111111115 (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) = a(n-1)+10^(n-1) = 10*a(n-1)-35 with n>0, a(0)=4.

G.f.: x*(5-40*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[(5-40*x)/((1-x)*(1-10*x)), {x, 0, 30}], x] (* Vincenzo Librandi, Jul 05 2012 *)

PROG

(Magma) [(10^n+35)/9: n in [1..20]]; // Vincenzo Librandi, Jul 05 2012

CROSSREFS

Sequence in context: A080490 A220825 A303230 * A244298 A050542 A091096

Adjacent sequences:  A173733 A173734 A173735 * A173737 A173738 A173739

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Feb 23 2010

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 2 23:51 EDT 2022. Contains 357230 sequences. (Running on oeis4.)