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A199173 Decimal expansion of x>0 satisfying x^2+x*cos(x)=2. 3
1, 2, 7, 6, 6, 7, 1, 3, 6, 7, 9, 4, 0, 7, 6, 0, 5, 5, 4, 0, 9, 1, 5, 0, 7, 4, 9, 0, 4, 4, 1, 2, 1, 0, 2, 7, 8, 3, 4, 0, 0, 2, 4, 6, 4, 7, 3, 4, 5, 6, 7, 6, 0, 6, 1, 5, 6, 6, 2, 8, 7, 6, 7, 4, 1, 2, 5, 9, 6, 3, 2, 8, 0, 1, 0, 9, 7, 6, 3, 1, 1, 9, 2, 3, 4, 4, 1, 8, 2, 9, 4, 3, 2, 4, 2, 4, 5, 7, 8 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,2

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: -1.4669783053971235684198141847804443...

positive:  1.27667136794076055409150749044121027834...

MATHEMATICA

a = 1; b = 1; c = 2;

f[x_] := a*x^2 + b*x*Cos[x]; g[x_] := c

Plot[{f[x], g[x]}, {x, -2 Pi, 2 Pi}, {AxesOrigin -> {0, 0}}]

r = x /. FindRoot[f[x] == g[x], {x, -1.5, -1.3}, WorkingPrecision -> 110]

RealDigits[r]  (* A199172 *)

r = x /. FindRoot[f[x] == g[x], {x, 1.27, .28}, WorkingPrecision -> 110]

RealDigits[r]  (* A199173 *)

CROSSREFS

Cf. A199170.

Sequence in context: A110988 A047224 A127817 * A047232 A103557 A210963

Adjacent sequences:  A199170 A199171 A199172 * A199174 A199175 A199176

KEYWORD

nonn,cons

AUTHOR

Clark Kimberling, Nov 04 2011

STATUS

approved

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Last modified November 20 13:03 EST 2019. Contains 329336 sequences. (Running on oeis4.)