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A200688 Decimal expansion of least x>0 satisfying 4-x^2=tan(x). 2
1, 1, 9, 8, 7, 8, 3, 7, 4, 3, 1, 5, 4, 6, 7, 2, 3, 3, 0, 7, 6, 6, 9, 4, 2, 2, 1, 1, 4, 5, 5, 5, 5, 3, 3, 3, 0, 7, 1, 3, 1, 2, 9, 2, 9, 6, 7, 2, 9, 2, 5, 1, 6, 4, 0, 9, 2, 5, 6, 0, 3, 9, 6, 9, 1, 0, 7, 0, 7, 3, 1, 1, 2, 4, 5, 3, 0, 9, 6, 1, 1, 9, 0, 8, 4, 2, 0, 1, 4, 4, 6, 5, 2, 9, 4, 3, 8, 7, 1 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

See A200614 for a guide to related sequences.  The Mathematica program includes a graph.

LINKS

Table of n, a(n) for n=1..99.

EXAMPLE

x=1.19878374315467233076694221145555333...

MATHEMATICA

a = -1; c = 4;

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, 1.1, 1.2}, WorkingPrecision -> 110]

RealDigits[r]   (* A200688 *)

CROSSREFS

Cf. A200338.

Sequence in context: A019890 A066666 A021905 * A288239 A163243 A060799

Adjacent sequences:  A200685 A200686 A200687 * A200689 A200690 A200691

KEYWORD

nonn,cons

AUTHOR

Clark Kimberling, Nov 21 2011

STATUS

approved

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Last modified April 7 10:46 EDT 2020. Contains 333301 sequences. (Running on oeis4.)