A201928 Decimal expansion of the x nearest 0 that satisfies x^2+4x+4=e^x.

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

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:  -2.3143699029676280191739133920...
nearest to 0:  -1.53607809402693113051136705...
greatest:  3.3566939800333213068257690241...

Mathematica

a = 1; b = 4; c = 4;
f[x_] := a*x^2 + b*x + c; g[x_] := E^x
Plot[{f[x], g[x]}, {x, -3, 3.5}, {AxesOrigin -> {0, 0}}]
r = x /. FindRoot[f[x] == g[x], {x, -2.4, -2.3}, WorkingPrecision -> 110]
RealDigits[r]     (* A201927 *)
r = x /. FindRoot[f[x] == g[x], {x, -1.6, -1.5}, WorkingPrecision -> 110]
RealDigits[r]     (* A201928 *)
 r = x /. FindRoot[f[x] == g[x], {x, 3.3, 3.4}, WorkingPrecision -> 110]
RealDigits[r]     (* A201929 *)

Crossrefs

Cf. A201741.

Sequence in context: A019212 A374642 A374641 * A021655 A360270 A083237

Adjacent sequences: A201925 A201926 A201927 * A201929 A201930 A201931

Keyword

nonn,cons

Author

Clark Kimberling, Dec 06 2011

Status

approved