A086945 a(n) = 7*10^n - 9.

61, 691, 6991, 69991, 699991, 6999991, 69999991, 699999991, 6999999991, 69999999991, 699999999991, 6999999999991, 69999999999991, 699999999999991, 6999999999999991, 69999999999999991, 699999999999999991, 6999999999999999991, 69999999999999999991

Offset

1,1

Comments

a(n) = k where R(k+9) = 7.

R(a(n)) = A086940(n).

Links

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

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

Mathematica

Table[10 FromDigits[PadRight[{6}, n, 9]]+1, {n, 20}] (* Harvey P. Dale, Aug 14 2021 *)

Prog

(Magma) [7*10^n-9: n in [1..25] ]; // Vincenzo Librandi, Aug 22 2011

Crossrefs

Sequence in context: A092571 A119597 A132388 * A142365 A251426 A232858

Adjacent sequences: A086942 A086943 A086944 * A086946 A086947 A086948

Keyword

nonn,easy

Author

Ray Chandler, Jul 24 2003

Status

approved