A086948 a(n) = k where R(k+8) = 2.

12, 192, 1992, 19992, 199992, 1999992, 19999992, 199999992, 1999999992, 19999999992, 199999999992, 1999999999992, 19999999999992, 199999999999992, 1999999999999992, 19999999999999992, 199999999999999992

Offset

1,1

Comments

R(a(n)) = A086947(n).

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..300

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

Formula

a(n) = 2*(10^n - 4).

From Chai Wah Wu, Aug 01 2020: (Start)

a(n) = 11*a(n-1) - 10*a(n-2) for n > 2.

G.f.: x*(60*x + 12)/((x - 1)*(10*x - 1)). (End)

Mathematica

Table[10*FromDigits[PadRight[{1}, n, 9]]+2, {n, 20}] (* Harvey P. Dale, Dec 15 2017 *)

Prog

(Magma) [2*(10^n-4): n in [1..25] ]; // Vincenzo Librandi, Aug 22 2011

Crossrefs

Cf. A085331.

Sequence in context: A230757 A196483 A196716 * A230539 A230750 A358367

Adjacent sequences: A086945 A086946 A086947 * A086949 A086950 A086951

Keyword

nonn,easy

Author

Ray Chandler, Jul 24 2003

Status

approved