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%I #13 Jun 30 2023 15:20:21
%S 35,665,6965,69965,699965,6999965,69999965,699999965,6999999965,
%T 69999999965,699999999965,6999999999965,69999999999965,
%U 699999999999965,6999999999999965,69999999999999965,699999999999999965
%N 7*(10^n-5)
%H Vincenzo Librandi, <a href="/A175774/b175774.txt">Table of n, a(n) for n = 1..100</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) +315. - _Vincenzo Librandi_, Jul 12 2012
%F G.f.: x*(35+280*x)/((1-10*x)*(1-x)). - _Vincenzo Librandi_, Jul 12 2012
%t CoefficientList[Series[(35+280*x)/((1-10*x)*(1-x)),{x,0,20}],x] (* _Vincenzo Librandi_, Jul 12 2012 *)
%o (Magma) [7*(10^n-5): n in [1..20]]; // _Vincenzo Librandi_, Jul 12 2012
%K nonn,easy
%O 1,1
%A _Vincenzo Librandi_, Nov 15 2010.
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