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%I #13 Sep 08 2022 08:46:00
%S 8,71,701,7001,70001,700001,7000001,70000001,700000001,7000000001,
%T 70000000001,700000000001,7000000000001,70000000000001,
%U 700000000000001,7000000000000001,70000000000000001,700000000000000001,7000000000000000001
%N 7*10^n+1.
%H Vincenzo Librandi, <a href="/A199687/b199687.txt">Table of n, a(n) for n = 0..1000</a>
%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (11,-10).
%F a(n) = 10*a(n-1)-9.
%F a(n) = 11*a(n-1)-10*a(n-2).
%F G.f.: (8-17*x)/((1-x)*(1-10*x)).
%t 7*10^Range[0,20]+1 (* or *) LinearRecurrence[{11,-10},{8,71},20] (* _Harvey P. Dale_, May 29 2018 *)
%o (Magma) [7*10^n+1: n in [0..30]];
%K nonn,easy
%O 0,1
%A _Vincenzo Librandi_, Nov 09 2011
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