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 A019899 #22 Jul 08 2025 07:43:00
%S A019899 0,1,7,4,5,5,0,6,4,9,2,8,2,1,7,5,8,5,7,6,5,1,2,8,8,9,5,2,1,9,7,2,7,8,
%T A019899 2,4,3,1,4,1,0,1,5,8,8,8,3,9,8,7,5,2,7,6,9,0,4,7,1,1,4,2,7,1,0,2,1,0,
%U A019899 4,8,5,4,8,5,6,4,6,2,3,6,7,6,2,2,8,8,9,6,8,9,1,5,8,2,9,9,2,0,3,8
%N A019899 Decimal expansion of tangent of 1 degree.
%C A019899 Algebraic integer of degree 24. - _Charles R Greathouse IV_, May 15 2019
%D A019899 Mohammad K. Azarian, Forty-Five Nested Equilateral Triangles and cosecant of 1 degree, Problem 813, College Mathematics Journal, Vol. 36, No. 5, November 2005, p. 413-414. Solution published in Vol. 37 , No. 5, November 2006, pp. 394-395.
%H A019899 Ivan Panchenko, <a href="/A019899/b019899.txt">Table of n, a(n) for n = 0..1000</a>
%H A019899 <a href="/index/Al#algebraic_24">Index entries for algebraic numbers, degree 24</a>.
%e A019899 0.0174550649282175857651288952197278243141...
%t A019899 Join[{0},RealDigits[Tan[1 Degree],10,120][[1]]] (* _Harvey P. Dale_, Mar 30 2013 *)
%o A019899 (PARI) tan(Pi/180) \\ _Charles R Greathouse IV_, May 15 2019
%K A019899 nonn,cons
%O A019899 0,3
%A A019899 _N. J. A. Sloane_
%E A019899 Corrected by _Mohammad K. Azarian_, Dec 15 2005