A086942 Integers k such that R(k+8) = 4.

32, 392, 3992, 39992, 399992, 3999992, 39999992, 399999992, 3999999992, 39999999992, 399999999992, 3999999999992, 39999999999992, 399999999999992, 3999999999999992, 39999999999999992, 399999999999999992, 3999999999999999992, 39999999999999999992

Offset

1,1

Comments

R(a(n)) = A086943(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) = 4*10^n-8.

G.f.: 8*x*(5*x+4)/((10*x-1)*(x-1)).

a(n) = 8 * A198971(n-1).

Mathematica

4*10^Range[20] - 8 (* Paolo Xausa, Sep 21 2024 *)

Prog

(Magma) [4*10^n-8: n in [1..25]]; // Vincenzo Librandi, Aug 22 2011

Crossrefs

Cf. A004086, A086943, A198971.

Sequence in context: A301489 A087024 A128798 * A247995 A247996 A068548

Adjacent sequences: A086939 A086940 A086941 * A086943 A086944 A086945

Keyword

nonn,base,easy

Author

Ray Chandler, Jul 24 2003

Status

approved