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A201410 Decimal expansion of least x satisfying 4*x^2=sec(x) and 0<x<pi. 3
5, 3, 9, 8, 6, 1, 0, 8, 3, 9, 1, 2, 7, 7, 8, 4, 4, 3, 6, 3, 0, 6, 7, 3, 7, 3, 2, 7, 3, 2, 2, 8, 0, 7, 1, 4, 8, 0, 6, 2, 4, 1, 1, 2, 0, 9, 8, 1, 6, 0, 0, 5, 5, 4, 0, 8, 2, 8, 9, 8, 5, 4, 6, 1, 6, 0, 8, 1, 4, 4, 0, 2, 1, 2, 2, 0, 9, 8, 5, 5, 6, 0, 8, 2, 7, 8, 7, 3, 2, 0, 6, 5, 3, 0, 5, 9, 8, 2, 7 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

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

LINKS

Table of n, a(n) for n=0..98.

EXAMPLE

least:  0.53986108391277844363067373273228071480624...

greatest: 1.451925722123287999446946604502079960054...

MATHEMATICA

a = 4; 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, .5, .6}, WorkingPrecision -> 110]

RealDigits[r]    (* A201410 *)

r = x /. FindRoot[f[x] == g[x], {x, 1.4, 1.5}, WorkingPrecision -> 110]

RealDigits[r]    (* A201411 *)

CROSSREFS

Cf. A201397.

Sequence in context: A086970 A224511 A201938 * A019955 A296345 A317907

Adjacent sequences:  A201407 A201408 A201409 * A201411 A201412 A201413

KEYWORD

nonn,cons

AUTHOR

Clark Kimberling, Dec 01 2011

STATUS

approved

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Last modified December 14 01:03 EST 2019. Contains 329977 sequences. (Running on oeis4.)