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 A019903 #27 Jul 08 2025 07:43:23
%S A019903 0,8,7,4,8,8,6,6,3,5,2,5,9,2,4,0,0,5,2,2,2,0,1,8,6,6,9,4,3,4,9,6,1,4,
%T A019903 5,8,1,1,9,4,5,4,2,7,6,3,6,8,1,0,8,2,2,9,1,4,5,2,3,6,6,6,2,2,2,1,6,4,
%U A019903 1,4,2,7,3,0,2,6,1,2,8,4,1,6,1,9,1,2,3,7,3,2,3,7,0,0,6,4,0,9,7,5
%N A019903 Decimal expansion of tangent of 5 degrees.
%C A019903 Also the decimal expansion of cotangent of 85 degrees. - _Mohammad K. Azarian_, Jun 30 2013
%C A019903 Or tangent of Pi/36 radians or cotangent of 17Pi/36 radians. - _Alonso del Arte_, Jun 30 2013
%H A019903 Ivan Panchenko, <a href="/A019903/b019903.txt">Table of n, a(n) for n = 0..1000</a>
%e A019903 0.0874886635259240052220186694...
%t A019903 RealDigits[Tan[Pi/36], 10, 105][[1]] (* _Alonso del Arte_, Jun 30 2013 *)
%t A019903 Join[{0},RealDigits[Tan[5 Degree],10,120][[1]]] (* _Harvey P. Dale_, Aug 01 2021 *)
%K A019903 nonn,cons
%O A019903 0,2
%A A019903 _N. J. A. Sloane_
%E A019903 Zero added in front by _R. J. Mathar_, Feb 05 2009