This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A177079 #33 Jun 28 2025 18:11:16
%S A177079 35,485,4985,49985,499985,4999985,49999985,499999985,4999999985,
%T A177079 49999999985,499999999985,4999999999985,49999999999985,
%U A177079 499999999999985,4999999999999985,49999999999999985,499999999999999985,4999999999999999985,49999999999999999985,499999999999999999985
%N A177079 a(n) = 5*(10^n - 3).
%H A177079 Vincenzo Librandi, <a href="/A177079/b177079.txt">Table of n, a(n) for n = 1..300</a>
%H A177079 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (11,-10).
%F A177079 From _Elmo R. Oliveira_, Jun 12 2025: (Start)
%F A177079 G.f.: 5*x*(20*x+7)/((x-1)*(10*x-1)).
%F A177079 E.g.f.: 5*(2 - 3*exp(x) + exp(10*x)).
%F A177079 a(n) = 5*A173833(n).
%F A177079 a(n) = 11*a(n-1) - 10*a(n-2) for n > 2. (End)
%t A177079 Table[5*(10^n-3),{n,20}]; (* _Alonso del Arte_, Nov 15 2010 *)
%t A177079 LinearRecurrence[{11,-10},{35,485},20] (* _Harvey P. Dale_, Aug 20 2023 *)
%o A177079 (Magma) [5*(10^n-3): n in [1..35]];
%o A177079 (PARI) a(n)=5*10^n-15 \\ _Charles R Greathouse IV_, Jun 04 2011
%Y A177079 Cf. A173833.
%K A177079 nonn,easy
%O A177079 1,1
%A A177079 _Vincenzo Librandi_