A199283 Decimal expansion of x<0 satisfying 3*x^2+x*cos(x)=3.

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

Offset

1,3

Comments

See A199170 for a guide to related sequences. The Mathematica program includes a graph.

Links

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

Example

negative: -1.081411597194677548285153751592164...
positive:  0.901983106002417964495821536577097...

Mathematica

a = 3; b = 1; c = 3;
f[x_] := a*x^2 + b*x*Cos[x]; g[x_] := c
Plot[{f[x], g[x]}, {x, -3, 3}, {AxesOrigin -> {0, 0}}]
r = x /. FindRoot[f[x] == g[x], {x, -1.1, -1.0}, WorkingPrecision -> 110]
RealDigits[r]     (* A199283 *)
r = x /. FindRoot[f[x] == g[x], {x, .9, 1}, WorkingPrecision -> 110]
RealDigits[r]    (* A199284 *)

Crossrefs

Cf. A199170.

Sequence in context: A358286 A176457 A110194 * A079359 A010156 A197590

Adjacent sequences: A199280 A199281 A199282 * A199284 A199285 A199286

Keyword

nonn,cons

Author

Clark Kimberling, Nov 05 2011

Status

approved