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 A133472 6 followed by numbers with n-1 0's between 1 and 5. 1
 6, 15, 105, 1005, 10005, 100005, 1000005, 10000005, 100000005, 1000000005, 10000000005, 100000000005, 1000000000005, 10000000000005, 100000000000005, 1000000000000005, 10000000000000005, 100000000000000005 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..500 Index entries for linear recurrences with constant coefficients, signature (11,-10). FORMULA From R. J. Mathar, Nov 30 2007: (Start) O.g.f.: -3*(-2+17*x)/((-1+x)*(-1+10*x)) = -5/(-1+x) - 1/(-1+10*x). a(n) = 10*a(n-1) - 45. (End) a(n) = 10^(n-1) + 5 for n >= 1. - Paolo P. Lava, Dec 19 2007 a(n) = 10^n + 5. - Vincenzo Librandi, Aug 10 2011 MATHEMATICA Join[{6}, Table[10*FromDigits[PadRight[{1}, n, 0]]+5, {n, 20}]] (* or *) LinearRecurrence[{11, -10}, {6, 15}, 20] (* Harvey P. Dale, Sep 06 2020 *) PROG (MAGMA) [10^n+5: n in [0..20]]; // Vincenzo Librandi, Aug 10 2011 CROSSREFS Cf. A068128, A133384. Sequence in context: A068128 A013222 A013228 * A213873 A219771 A087137 Adjacent sequences:  A133469 A133470 A133471 * A133473 A133474 A133475 KEYWORD nonn,easy AUTHOR Paul Curtz, Nov 29 2007 STATUS approved

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Last modified August 19 20:38 EDT 2022. Contains 356231 sequences. (Running on oeis4.)