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A201751 Decimal expansion of the least x satisfying -x^2+2=e^x. 3
1, 3, 1, 5, 9, 7, 3, 7, 7, 7, 7, 9, 6, 2, 9, 0, 1, 8, 7, 8, 8, 7, 1, 7, 7, 3, 8, 7, 3, 0, 1, 2, 7, 1, 0, 4, 8, 0, 1, 8, 9, 3, 7, 8, 5, 6, 0, 5, 1, 1, 5, 2, 5, 1, 3, 8, 4, 8, 7, 8, 1, 5, 9, 7, 3, 3, 6, 8, 8, 0, 0, 4, 3, 3, 5, 4, 6, 2, 5, 1, 1, 2, 1, 4, 4, 0, 1, 5, 4, 4, 0, 8, 3, 8, 5, 5, 4, 1, 6 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See A201741 for a guide to related sequences.  The Mathematica program includes a graph.

LINKS

Table of n, a(n) for n=1..99.

EXAMPLE

least:  -1.3159737777962901878871773873012710...

greatest:  0.53727444917385660425676298977967...

MATHEMATICA

a = -1; b = 0; c = 2;

f[x_] := a*x^2 + b*x + c; g[x_] := E^x

Plot[{f[x], g[x]}, {x, -2, 1}, {AxesOrigin -> {0, 0}}]

r = x /. FindRoot[f[x] == g[x], {x, -1.4, -1.3}, WorkingPrecision -> 110]

RealDigits[r]    (* A201751 *)

r = x /. FindRoot[f[x] == g[x], {x, .5, .6}, WorkingPrecision -> 110]

RealDigits[r]    (* A201752 *)

CROSSREFS

Cf. A201741.

Sequence in context: A187370 A215456 A225855 * A202504 A055199 A146916

Adjacent sequences:  A201748 A201749 A201750 * A201752 A201753 A201754

KEYWORD

nonn,cons

AUTHOR

Clark Kimberling, Dec 05 2011

STATUS

approved

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Last modified February 18 03:33 EST 2020. Contains 332006 sequences. (Running on oeis4.)