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A086948 a(n) = k where R(k+8) = 2. 2
12, 192, 1992, 19992, 199992, 1999992, 19999992, 199999992, 1999999992, 19999999992, 199999999992, 1999999999992, 19999999999992, 199999999999992, 1999999999999992, 19999999999999992, 199999999999999992 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

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

LINKS

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

FORMULA

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

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 A212596

Adjacent sequences:  A086945 A086946 A086947 * A086949 A086950 A086951

KEYWORD

nonn,easy

AUTHOR

Ray Chandler, Jul 24 2003

STATUS

approved

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Last modified December 16 06:18 EST 2019. Contains 330016 sequences. (Running on oeis4.)