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A200691
Decimal expansion of least x>0 satisfying 7-x^2=tan(x).
2
1, 3, 7, 7, 2, 8, 8, 1, 9, 6, 8, 0, 4, 0, 2, 9, 3, 6, 0, 2, 4, 2, 7, 6, 0, 4, 4, 1, 0, 7, 8, 4, 1, 3, 5, 2, 5, 5, 7, 4, 8, 6, 0, 9, 1, 9, 6, 7, 3, 0, 0, 1, 9, 9, 2, 2, 9, 0, 8, 9, 4, 5, 6, 9, 9, 7, 3, 7, 8, 5, 4, 4, 1, 3, 7, 3, 0, 4, 0, 8, 0, 6, 1, 8, 5, 6, 6, 9, 5, 3, 5, 2, 4, 6, 7, 2, 9, 5, 9, 9
OFFSET
1,2
COMMENTS
See A200614 for a guide to related sequences. The Mathematica program includes a graph.
EXAMPLE
x=1.377288196804029360242760441078413525574860...
MATHEMATICA
a = -1; c = 7;
f[x_] := a*x^2 + c; g[x_] := Tan[x]
Plot[{f[x], g[x]}, {x, -.1, Pi/2}, {AxesOrigin -> {0, 0}}]
r = x /. FindRoot[f[x] == g[x], {x, 1.3, 1.4}, WorkingPrecision -> 110]
RealDigits[r] (* A200691 *)
CROSSREFS
Cf. A200338.
Sequence in context: A349614 A349613 A016620 * A021269 A199277 A346588
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Nov 21 2011
STATUS
approved