login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A201937 Decimal expansion of the greatest negative number x satisfying 2*x^2=e^(-x). 3
1, 4, 8, 7, 9, 6, 2, 0, 6, 5, 4, 9, 8, 1, 7, 7, 1, 5, 6, 2, 5, 4, 3, 7, 0, 1, 2, 0, 9, 3, 2, 6, 3, 2, 5, 6, 3, 7, 2, 6, 4, 8, 4, 2, 4, 3, 7, 8, 0, 2, 1, 0, 6, 8, 4, 6, 2, 3, 6, 9, 6, 8, 9, 7, 7, 2, 6, 8, 6, 8, 0, 9, 4, 4, 6, 2, 7, 6, 8, 7, 4, 4, 2, 2, 8, 9, 2, 0, 8, 3, 0, 1, 2, 0, 9, 0, 1, 8, 8 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
See A201936 for a guide to related sequences. The Mathematica program includes a graph.
LINKS
EXAMPLE
least x: -2.617866613066812769178978059143202...
greatest negative x: -1.487962065498177156254...
greatest x: 0.5398352769028200492118039083633...
MATHEMATICA
a = 2; b = 0; c = 0;
f[x_] := a*x^2 + b*x + c; g[x_] := E^-x
Plot[{f[x], g[x]}, {x, -3, 2}, {AxesOrigin -> {0, 0}}]
r = x /. FindRoot[f[x] == g[x], {x, -3, -2}, WorkingPrecision -> 110]
RealDigits[r] (* A201936 *)
r = x /. FindRoot[f[x] == g[x], {x, -2, -1}, WorkingPrecision -> 110]
RealDigits[r] (* A201937 *)
r = x /. FindRoot[f[x] == g[x], {x, .5, .6}, WorkingPrecision -> 110]
RealDigits[r] (* A201938 *)
CROSSREFS
Cf. A201936.
Sequence in context: A021209 A247605 A244000 * A211456 A309665 A196205
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Dec 13 2011
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)