A175774 7*(10^n-5)

35, 665, 6965, 69965, 699965, 6999965, 69999965, 699999965, 6999999965, 69999999965, 699999999965, 6999999999965, 69999999999965, 699999999999965, 6999999999999965, 69999999999999965, 699999999999999965

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..100

Index entries for linear recurrences with constant coefficients, signature (11, -10).

Formula

a(n) = 10*a(n-1) +315. - Vincenzo Librandi, Jul 12 2012

G.f.: x*(35+280*x)/((1-10*x)*(1-x)). - Vincenzo Librandi, Jul 12 2012

Mathematica

CoefficientList[Series[(35+280*x)/((1-10*x)*(1-x)), {x, 0, 20}], x] (* Vincenzo Librandi, Jul 12 2012 *)

Prog

(Magma) [7*(10^n-5): n in [1..20]]; // Vincenzo Librandi, Jul 12 2012

Crossrefs

Sequence in context: A010987 A178353 A202127 * A112504 A140405 A367250

Adjacent sequences: A175771 A175772 A175773 * A175775 A175776 A175777

Keyword

nonn,easy

Author

Vincenzo Librandi, Nov 15 2010.

Status

approved