A199267 Decimal expansion of x < 0 satisfying 2*x^2 + x*cos(x) = 3.

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

Offset: 1

Author

Clark Kimberling, Nov 04 2011

Keywords

• nonn
• cons

Comments

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

Examples

			negative: -1.29477176551027054190068103147021856144266...
positive:  1.120827899072464105010802655123824414841540...
		

Links

• Index entries for transcendental numbers.

Crossrefs

Cf. A199170, A199268.

Programs

Mathematica

a = 2; b = 1; c = 3;
f[x_] := a*x^2 + b*x*Cos[x]; g[x_] := c
Plot[{f[x], g[x]}, {x, -2, 2}, {AxesOrigin -> {0, 0}}]
r = x /. FindRoot[f[x] == g[x], {x, -1.3, -1.2}, WorkingPrecision -> 110]
RealDigits[r]    (* A199267 *)
r = x /. FindRoot[f[x] == g[x], {x, 1.12, 1.13}, WorkingPrecision -> 110]
RealDigits[r]    (* A199268 *)

Extensions

a(93) onwards corrected by Georg Fischer, Aug 03 2021