A201586 Decimal expansion of greatest x satisfying 3*x^2 = csc(x) and 0 < x < Pi.

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

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

Index entries for transcendental numbers.

Example

least:  0.71361154106545351696712348748482823114400555...
greatest:  3.10705708466927913942133639758902326551860...

Mathematica

a = 3; c = 0;
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, .7, .8}, WorkingPrecision -> 110]
RealDigits[r]    (* A201585 *)
r = x /. FindRoot[f[x] == g[x], {x, 3.1, 3.14}, WorkingPrecision -> 110]
RealDigits[r]    (* A201586 *)

Prog

(PARI) a=3; c=0; solve(x=3.1, 3.14, a*x^2 + c - 1/sin(x)) \\ G. C. Greubel, Aug 22 2018

Crossrefs

Cf. A201564.

Sequence in context: A058140 A074678 A363976 * A130888 A010601 A176108

Adjacent sequences: A201583 A201584 A201585 * A201587 A201588 A201589

Keyword

nonn,cons,changed

Author

Clark Kimberling, Dec 03 2011

Status

approved