%I #4 Jun 14 2020 22:49:27
%S 1,1,2,1,5,5,3,1,8,2,4,0,0,7,3,6,0,3,1,2,0,8,1,8,5,7,1,7,1,4,4,7,9,3,
%T 7,5,2,6,2,4,5,2,5,5,1,6,6,7,0,5,0,8,8,5,4,7,8,5,0,2,3,3,8,8,2,7,9,0,
%U 1,5,9,7,1,7,7,5,6,0,8,4,0,6,4,5,2,3
%N Decimal expansion of arclength between (0,1) and (1,1/2) on y = 1/2^x.
%e arclength = 1.1215531824007360312081857171447937526245255166...
%t s = Integrate[Sqrt[1 + D[2^(-x), x]^2], {x, 0, 1}]
%t r = N[s, 200]
%t RealDigits[r][[1]]
%Y Cf. A333202, A332630.
%K nonn,cons,easy
%O 1,3
%A _Clark Kimberling_, Jun 12 2020