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A199215 4*5^n+1. 1

%I

%S 5,21,101,501,2501,12501,62501,312501,1562501,7812501,39062501,

%T 195312501,976562501,4882812501,24414062501,122070312501,610351562501,

%U 3051757812501,15258789062501,76293945312501,381469726562501,1907348632812501

%N 4*5^n+1.

%H Vincenzo Librandi, <a href="/A199215/b199215.txt">Table of n, a(n) for n = 0..1000</a>

%H <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (6,-5).

%F a(n) = 5*a(n-1)-4.

%F a(n) = 6*a(n-1)-5*a(n-2).

%F G.f.: (5-9*x)/((1-x)*(1-5*x)). - Bruno Berselli, Nov 04 2011

%t 4*5^Range[0,30]+1 (* or *) LinearRecurrence[{6,-5},{5,21},30] (* _Harvey P. Dale_, Mar 30 2018 *)

%o (MAGMA) [4*5^n+1: n in [0..30]];

%K nonn,easy

%O 0,1

%A _Vincenzo Librandi_, Nov 04 2011

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Last modified October 23 08:40 EDT 2021. Contains 348211 sequences. (Running on oeis4.)