A198108 Decimal expansion of least x having x^2+3x=4*cos(x).

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

Offset

1,1

Comments

See A197737 for a guide to related sequences. The Mathematica program includes a graph.

Links

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

Example

least x: -2.072191302711809327379682290027003...
greatest x: 0.7657264429205407174831010492394...

Mathematica

a = 1; b = 3; c = 4;
f[x_] := a*x^2 + b*x; g[x_] := c*Cos[x]
Plot[{f[x], g[x]}, {x, -3, 1}]
r1 = x /. FindRoot[f[x] == g[x], {x, -2.1, -2.9}, WorkingPrecision -> 110]
RealDigits[r1] (* A198108 *)
r2 = x /. FindRoot[f[x] == g[x], {x, .76, .77}, WorkingPrecision -> 110]
RealDigits[r2] (* A198109 *)

Crossrefs

Cf. A197737.

Sequence in context: A254445 A346670 A140663 * A300704 A300702 A353273

Adjacent sequences: A198105 A198106 A198107 * A198109 A198110 A198111

Keyword

nonn,cons

Author

Clark Kimberling, Oct 21 2011

Status

approved