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%I #7 Jun 01 2022 18:11:39
%S 1,2,7,7,9,7,8,0,5,9,2,7,7,9,3,4,4,1,8,5,6,7,0,5,6,6,2,3,0,2,9,8,3,3,
%T 4,4,9,7,2,1,7,7,0,7,8,6,6,9,4,2,2,5,5,0,2,0,8,2,9,3,3,7,0,0,9,6,4,5,
%U 1,6,9,1,2,0,1,2,4,8,9,1,7,9,3,9,7,6
%N Decimal expansion of arclength between (0,0) and (Pi/4,1) on y = tan x.
%e arclength = 1.277978059277934418567056623029833449721770...
%t s = Integrate[Sqrt[1 + D[Tan[x], x]^2], {x, 0, Pi/4}]
%t r = N[s, 200]
%t RealDigits[r][[1]]
%Y Cf. A333202, A332634, A332635.
%K nonn,cons,easy
%O 1,2
%A _Clark Kimberling_, Jun 12 2020
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