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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
OFFSET
1,1
COMMENTS
a(n) = k where R(k+9) = 7.
R(a(n)) = A086940(n).
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 A372963 A251426
KEYWORD
nonn,easy
AUTHOR
Ray Chandler, Jul 24 2003
STATUS
approved