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 A334842 #5 Jun 15 2020 13:38:54
%S A334842 2,0,5,6,9,9,9,7,4,0,0,7,8,7,2,4,2,3,3,2,5,1,0,1,7,9,3,0,6,9,1,4,0,9,
%T A334842 5,4,9,6,4,5,5,4,1,9,8,6,6,9,8,8,5,6,6,5,2,0,6,2,0,3,9,3,2,7,1,3,8,3,
%U A334842 2,6,3,0,2,1,9,3,4,1,6,9,9,0,1,5,5,7
%N A334842 Decimal expansion of arclength between (0,0) and (Pi/3,sqrt(3)) on y = tan x.
%e A334842 arclength = 2.056999740078724233251017930691409549645541986...
%t A334842 s = Integrate[Sqrt[1 + D[Tan[x], x]^2], {x, 0, Pi/3}]
%t A334842 r = N[s, 200]
%t A334842 RealDigits[r][[1]]
%Y A334842 Cf. A333202, A332633, A334843.
%K A334842 nonn,cons,easy
%O A334842 1,1
%A A334842 _Clark Kimberling_, Jun 15 2020