A086940 a(n) = k where R(k+4) = 2.

16, 196, 1996, 19996, 199996, 1999996, 19999996, 199999996, 1999999996, 19999999996, 199999999996, 1999999999996, 19999999999996, 199999999999996, 1999999999999996, 19999999999999996, 199999999999999996, 1999999999999999996, 19999999999999999996

Offset

1,1

Comments

R(a(n)) = A086945(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-2).

a(n) = 11*a(n-1) - 10*a(n-2); a(1)=16, a(2)=196. - Harvey P. Dale, Aug 11 2012

Mathematica

Table[FromDigits[Join[PadRight[{1}, n, 9], {6}]], {n, 20}] (* or *) 2 (10^Range[20] - 2) (* or *) LinearRecurrence[{11, -10}, {16, 196}, 20] (* Harvey P. Dale, Aug 11 2012 *)

Prog

(Magma) [2*(10^n-2): n in [1..20] ]; // Vincenzo Librandi, Aug 22 2011

Crossrefs

Sequence in context: A017318 A173668 A126981 * A016173 A005747 A103721

Adjacent sequences: A086937 A086938 A086939 * A086941 A086942 A086943

Keyword

nonn,easy

Author

Ray Chandler, Jul 24 2003

Status

approved