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A177074
3*(10^n-5).
1
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
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
KEYWORD
nonn,easy
STATUS
approved