A200684 Decimal expansion of the greater of two values of x satisfying 4*x^2 = tan(x) and 0 < x < Pi/2.

1, 4, 5, 2, 9, 1, 6, 1, 6, 0, 9, 1, 6, 5, 1, 4, 5, 1, 8, 7, 4, 2, 7, 4, 8, 6, 8, 7, 5, 9, 0, 4, 4, 8, 3, 2, 3, 2, 4, 0, 2, 2, 5, 9, 9, 9, 0, 3, 2, 5, 0, 9, 5, 1, 4, 9, 7, 6, 4, 6, 3, 1, 3, 0, 5, 3, 3, 6, 2, 8, 3, 7, 1, 6, 6, 5, 5, 6, 8, 6, 0, 7, 3, 1, 9, 9, 2, 4, 8, 3, 1, 1, 1, 7, 1, 5, 3, 1, 2

Offset

1,2

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

lesser:  0.25558996674656780347141263353981468112668...
greater: 1.45291616091651451874274868759044832324022...

Mathematica

a = 4; c = 0;
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, .2, .3}, WorkingPrecision -> 110]
RealDigits[r](* A200683 *)
r = x /. FindRoot[f[x] == g[x], {x, 1.4, 1.5}, WorkingPrecision -> 110]
RealDigits[r](* A200684 *)

Crossrefs

Cf. A200614, A200683.

Sequence in context: A111624 A019815 A281143 * A345210 A307385 A354700

Adjacent sequences: A200681 A200682 A200683 * A200685 A200686 A200687

Keyword

nonn,cons

Author

Clark Kimberling, Nov 20 2011

Status

approved