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 A335998 #8 Jul 08 2020 14:14:35
%S A335998 1,1,3,2,0,9,0,3,9,3,3,0,5,9,1,7,7,0,3,9,7,2,2,7,3,1,8,6,9,9,7,6,2,8,
%T A335998 1,8,9,1,3,4,5,2,2,7,2,1,3,8,3,5,9,8,2,6,4,3,5,6,9,3,3,1,1,2,0,5,4,6,
%U A335998 3,3,0,2,5,6,8,1,5,2,2,4,1,3,3,5,4,6
%N A335998 Decimal expansion of the arclength on xy = 1 from (1,1) to (2,1/2).
%e A335998 u = 1.13209039330591770397227318699762818913452272138359826435...
%t A335998 r = NIntegrate[Sqrt[1 + 1/x^4], {x, 1, 2}, WorkingPrecision -> 200]
%t A335998 RealDigits[r][[1]]
%Y A335998 Cf. A333202.
%K A335998 nonn,cons
%O A335998 1,3
%A A335998 _Clark Kimberling_, Jul 06 2020