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 A198856 a(n) = 9*8^n-1. 1
 8, 71, 575, 4607, 36863, 294911, 2359295, 18874367, 150994943, 1207959551, 9663676415, 77309411327, 618475290623, 4947802324991, 39582418599935, 316659348799487, 2533274790395903, 20266198323167231, 162129586585337855 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS The subsequence of primes begins: 71, 294911, 18874367, 83010348331692982271, no more through a(30). - Jonathan Vos Post, Oct 31 2011 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (9,-8). FORMULA a(n) = 8*a(n-1) + 7. a(n) = 9*a(n-1) - 8*a(n-2), n>1. G.f.: (8-x)/((1-x)*(1-8*x)). - Vincenzo Librandi, Oct 04 2014 MATHEMATICA CoefficientList[Series[(8 - x)/((1-x) (1 - 8 x)), {x, 0, 30}], x] (* Vincenzo Librandi, Oct 04 2014 *) PROG (MAGMA) [9*8^n-1: n in [0..30]]; CROSSREFS Sequence in context: A217328 A193102 A038145 * A320092 A015576 A070998 Adjacent sequences:  A198853 A198854 A198855 * A198857 A198858 A198859 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Oct 31 2011 STATUS approved

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Last modified October 21 14:52 EDT 2019. Contains 328301 sequences. (Running on oeis4.)