The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 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 Vincenzo Librandi, Table of n, a(n) for n = 1..100 Index entries for linear recurrences with constant coefficients, signature (11,-10). 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 *) 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 Adjacent sequences:  A175598 A175599 A175600 * A175602 A175603 A175604 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 2 02:12 EST 2021. Contains 349435 sequences. (Running on oeis4.)