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A201419 Decimal expansion of greatest x satisfying 8*x^2 = sec(x) and 0 < x < Pi. 3
1, 5, 1, 6, 4, 0, 9, 8, 4, 8, 1, 1, 1, 9, 3, 5, 5, 8, 9, 6, 3, 6, 2, 1, 8, 9, 4, 0, 7, 7, 5, 1, 9, 7, 0, 8, 0, 7, 6, 6, 7, 9, 5, 6, 1, 1, 8, 2, 4, 4, 3, 0, 6, 3, 4, 7, 6, 0, 8, 6, 1, 0, 3, 9, 9, 9, 5, 2, 4, 0, 4, 5, 1, 7, 0, 0, 0, 1, 2, 8, 9, 8, 1, 1, 2, 1, 9, 0, 3, 9, 7, 8, 2, 8, 9, 3, 9, 6, 8 (list; constant; graph; refs; listen; history; text; internal format)
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

least:  0.365868442181046909444887950918036646081...

greatest: 1.5164098481119355896362189407751970807...

MATHEMATICA

a = 8; c = 0;

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, .3, .4}, WorkingPrecision -> 110]

RealDigits[r]    (* A201418 *)

r = x /. FindRoot[f[x] == g[x], {x, 1.5, 1.6}, WorkingPrecision -> 110]

RealDigits[r]    (* A201419 *)

CROSSREFS

Cf. A201397.

Sequence in context: A088401 A077491 A086231 * A163336 A173898 A343344

Adjacent sequences:  A201416 A201417 A201418 * A201420 A201421 A201422

KEYWORD

nonn,cons

AUTHOR

Clark Kimberling, Dec 01 2011

STATUS

approved

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Last modified May 22 09:50 EDT 2022. Contains 353949 sequences. (Running on oeis4.)