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 A161019 #15 Jun 27 2023 03:25:09
%S A161019 1,0,0,3,3,4,6,7,2,0,8,5,4,5,0,5,4,5,0,5,8,0,8,0,0,4,5,7,8,1,1,1,1,5,
%T A161019 3,6,8,1,9,0,0,4,8,0,4,5,7,6,4,4,2,0,4,0,0,2,2,2,0,8,0,6,5,7,9,8,0,3,
%U A161019 2,1,1,2,8,8,5,6,7,3,8,7,0,3,4,7,9,3,0,4,8,0,3,4,8,7,3,0,9,1,4,6,0,5,8,1,1
%N A161019 Decimal expansion of tan(1/10).
%C A161019 By the Lindemann-Weierstrass theorem, this constant is transcendental. - _Charles R Greathouse IV_, May 13 2019
%H A161019 Harry J. Smith, <a href="/A161019/b161019.txt">Table of n, a(n) for n = 0..20000</a>
%H A161019 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A161019 0.100334672085450545058080045781111536819004804576442040022208065798032...
%t A161019 RealDigits[Tan[1/10], 10, 120][[1]] (* _Amiram Eldar_, Jun 27 2023 *)
%o A161019 (PARI) default(realprecision, 20080); x=10*tan(1/10); for (n=0, 20000, d=floor(x); x=(x-d)*10; write("b161019.txt", n, " ", d));
%Y A161019 Cf. A019433 (continued fraction).
%K A161019 cons,nonn
%O A161019 0,4
%A A161019 _Harry J. Smith_, Jun 14 2009