A201935 Decimal expansion of the greatest x satisfying x^2+5x+2=e^x.

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

Offset

1,1

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:  -4.5640783603793772013414868523420...
nearest to 0:  -0.259069533051109108686405...
greatest:  3.43200871161068035280379146269...

Mathematica

a = 1; b = 5; c = 2;
f[x_] := a*x^2 + b*x + c; g[x_] := E^x
Plot[{f[x], g[x]}, {x, -5, 3.5}, {AxesOrigin -> {0, 0}}]
 r = x /. FindRoot[f[x] == g[x], {x, -4.6, -4.5}, WorkingPrecision -> 110]
RealDigits[r]     (* A201933 *)
 r = x /. FindRoot[f[x] == g[x], {x, -.3, -.2}, WorkingPrecision -> 110]
RealDigits[r]     (* A201934 *)
 r = x /. FindRoot[f[x] == g[x], {x, 3.4, 3.5}, WorkingPrecision -> 110]
RealDigits[r]     (* A201935 *)

Crossrefs

Cf. A201741.

Sequence in context: A279588 A279590 A351113 * A225445 A167877 A308430

Adjacent sequences: A201932 A201933 A201934 * A201936 A201937 A201938

Keyword

nonn,cons

Author

Clark Kimberling, Dec 06 2011

Status

approved