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%I #17 Sep 08 2022 08:45:11
%S 61,691,6991,69991,699991,6999991,69999991,699999991,6999999991,
%T 69999999991,699999999991,6999999999991,69999999999991,
%U 699999999999991,6999999999999991,69999999999999991,699999999999999991,6999999999999999991,69999999999999999991
%N a(n) = 7*10^n - 9.
%C a(n) = k where R(k+9) = 7.
%C R(a(n)) = A086940(n).
%H Vincenzo Librandi, <a href="/A086945/b086945.txt">Table of n, a(n) for n = 1..300</a>
%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (11,-10).
%t Table[10 FromDigits[PadRight[{6},n,9]]+1,{n,20}] (* _Harvey P. Dale_, Aug 14 2021 *)
%o (Magma) [7*10^n-9: n in [1..25] ]; // _Vincenzo Librandi_, Aug 22 2011
%K nonn,easy
%O 1,1
%A _Ray Chandler_, Jul 24 2003
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