A201577 Decimal expansion of greatest x satisfying x^2 + 8 = csc(x) and 0 < x < Pi.

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

Offset

1,1

Comments

See A201564 for a guide to related sequences. The Mathematica program includes a graph.

Links

G. C. Greubel, Table of n, a(n) for n = 1..10000

Example

least:  0.125081922635997441289177701653785707187...
greatest:  3.084464140564380849459190595364646021...

Mathematica

a = 1; c = 8;
f[x_] := a*x^2 + c; g[x_] := Csc[x]
Plot[{f[x], g[x]}, {x, 0, Pi}, {AxesOrigin -> {0, 0}}]
r = x /. FindRoot[f[x] == g[x], {x, .1, .2}, WorkingPrecision -> 110]
RealDigits[r]   (* A201576 *)
r = x /. FindRoot[f[x] == g[x], {x, 3.0, 3.1}, WorkingPrecision -> 110]
RealDigits[r]   (* A201577 *)

Prog

(PARI) a=1; c=8; solve(x=3, 3.1, a*x^2 + c - 1/sin(x)) \\ G. C. Greubel, Aug 21 2018

Crossrefs

Cf. A201564.

Sequence in context: A244854 A144807 A157957 * A223854 A333567 A248424

Adjacent sequences: A201574 A201575 A201576 * A201578 A201579 A201580

Keyword

nonn,cons

Author

Clark Kimberling, Dec 03 2011

Status

approved