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A086945 a(n) = 7*10^n - 9. 2
61, 691, 6991, 69991, 699991, 6999991, 69999991, 699999991, 6999999991, 69999999991, 699999999991, 6999999999991, 69999999999991, 699999999999991, 6999999999999991, 69999999999999991, 699999999999999991, 6999999999999999991, 69999999999999999991 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 25 11:05 EDT 2022. Contains 356984 sequences. (Running on oeis4.)