A200619 Decimal expansion of x satisfying 3*x^2 + 2 = sec(x) and 0 < x < Pi.

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

Offset

1,2

Comments

See A201397 for a guide to related sequences. The Mathematica program includes a graph.

Links

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

Example

x=1.450149551561767740862216830909220135243...

Mathematica

a = 3; c = 2;
f[x_] := a*x^2 + c; g[x_] := Sec[x]
Plot[{f[x], g[x]}, {x, 0, Pi/2}, {AxesOrigin -> {0, 0}}]
r = x /. FindRoot[f[x] == g[x], {x, 1.4, 1.5}, WorkingPrecision -> 110]
RealDigits[r]   (* A200619 *)

Crossrefs

Cf. A201397.

Sequence in context: A143574 A262400 A075424 * A199621 A199390 A270914

Adjacent sequences: A200616 A200617 A200618 * A200620 A200621 A200622

Keyword

nonn,cons

Author

Clark Kimberling, Dec 02 2011

Status

approved