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%I #32 Sep 22 2024 02:19:01
%S 32,392,3992,39992,399992,3999992,39999992,399999992,3999999992,
%T 39999999992,399999999992,3999999999992,39999999999992,
%U 399999999999992,3999999999999992,39999999999999992,399999999999999992,3999999999999999992,39999999999999999992
%N Integers k such that R(k+8) = 4.
%C R(a(n)) = A086943(n).
%H Vincenzo Librandi, <a href="/A086942/b086942.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).
%F a(n) = 4*10^n-8.
%F G.f.: 8*x*(5*x+4)/((10*x-1)*(x-1)).
%F a(n) = 8 * A198971(n-1).
%t 4*10^Range[20] - 8 (* _Paolo Xausa_, Sep 21 2024 *)
%o (Magma) [4*10^n-8: n in [1..25]]; // _Vincenzo Librandi_, Aug 22 2011
%Y Cf. A004086, A086943, A198971.
%K nonn,base,easy
%O 1,1
%A _Ray Chandler_, Jul 24 2003