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!)
A175601 7*(10^n-9). 1
7, 637, 6937, 69937, 699937, 6999937, 69999937, 699999937, 6999999937, 69999999937, 699999999937, 6999999999937, 69999999999937, 699999999999937, 6999999999999937, 69999999999999937, 699999999999999937 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
G.f.: 7*x*(1 + 80*x)/((1 - x)*(1 - 10*x)). - Vincenzo Librandi, Aug 23 2014
a(n) = 11*a(n-1) - 10*a(n-2). - Vincenzo Librandi, Aug 23 2014
MATHEMATICA
CoefficientList[Series[7 (1 + 80 x)/((1 - x) (1 - 10 x)), {x, 0, 20}], x] (* Vincenzo Librandi, Aug 23 2014 *)
LinearRecurrence[{11, -10}, {7, 637}, 20] (* Harvey P. Dale, Nov 30 2022 *)
PROG
(Magma) [7*(10^n-9): n in [1..20]]; // Vincenzo Librandi, Aug 23 2014
CROSSREFS
Sequence in context: A319033 A182346 A333741 * A246113 A277839 A109542
KEYWORD
nonn
AUTHOR
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 March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)