A177074 3*(10^n-5).

15, 285, 2985, 29985, 299985, 2999985, 29999985, 299999985, 2999999985, 29999999985, 299999999985, 2999999999985, 29999999999985, 299999999999985, 2999999999999985, 29999999999999985, 299999999999999985

Offset

1,1

Comments

Apparently 15 times the entries in A067272. - R. J. Mathar, Aug 24 2011

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. 15*x*(1+8*x) / ( (10*x-1)*(x-1) ). - R. J. Mathar, Aug 24 2011

a(n) = 11*a(n-1) - 10*a(n-2), n>1. - Vincenzo Librandi, Apr 26 2014

Mathematica

Table[3*(10^n-5), {n, 20}] (* or *) LinearRecurrence[{11, -10}, {15, 285}, 20] (* Harvey P. Dale, Apr 25 2014 *)
CoefficientList[Series[15 (1 + 8 x)/((10 x - 1) (x - 1)), {x, 0, 40}], x] (* Vincenzo Librandi, Apr 26 2014 *)

Prog

(Magma) [3*(10^n-5): n in [1..20]]; // Vincenzo Librandi, Apr 26 2014

Crossrefs

Sequence in context: A279167 A249960 A249961 * A069405 A125055 A160397

Adjacent sequences: A177071 A177072 A177073 * A177075 A177076 A177077

Keyword

nonn,easy

Author

Vincenzo Librandi

Status

approved