A201581 Decimal expansion of greatest x satisfying x^2 + 10 = csc(x) and 0 < x < Pi.

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

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:  0.100066884072919309279805384459381115060...
greatest:  3.090421270152151453651497443899920534...

Mathematica

a = 1; c = 10;
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]   (* A201578 *)
r = x /. FindRoot[f[x] == g[x], {x, 3.0, 3.1}, WorkingPrecision -> 110]
RealDigits[r]   (* A201581 *)

Prog

(PARI) a=1; c=10; solve(x=3, 3.1, a*x^2 + c - 1/sin(x)) \\ G. C. Greubel, Aug 21 2018

Crossrefs

Cf. A201564.

Sequence in context: A019827 A329284 A269557 * A395954 A164597 A167295

Adjacent sequences: A201578 A201579 A201580 * A201582 A201583 A201584

Keyword

nonn,cons

Author

Clark Kimberling, Dec 03 2011

Status

approved