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 A198970 a(n) = 4*10^n-1. 1
 3, 39, 399, 3999, 39999, 399999, 3999999, 39999999, 399999999, 3999999999, 39999999999, 399999999999, 3999999999999, 39999999999999, 399999999999999, 3999999999999999, 39999999999999999, 399999999999999999, 3999999999999999999 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..200 Index entries for linear recurrences with constant coefficients, signature (11,-10). FORMULA a(n) = 3*A097166(n). a(n) = 10*a(n-1)+9, n>0. a(n) = 11*a(n-1)-10*a(n-2), n>1. G.f.: 3*(1 + 2*x)/(1 - 11*x + 10*x^2). - Vincenzo Librandi, Jan 03 2013 MATHEMATICA CoefficientList[Series[3*(1 + 2*x)/(1 - 11*x + 10*x^2), {x, 0, 30}], x] (* Vincenzo Librandi, Jan 03 2013 *) PROG (MAGMA) [4*10^n-1 : n in [0..20]] CROSSREFS Sequence in context: A191468 A203243 A063035 * A014850 A341671 A328809 Adjacent sequences:  A198967 A198968 A198969 * A198971 A198972 A198973 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Nov 01 2011 STATUS approved

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Last modified May 28 16:37 EDT 2022. Contains 354119 sequences. (Running on oeis4.)