login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A201940 Decimal expansion of x>0 satisfying x^2-1=e^(-x). 2
1, 1, 4, 7, 7, 5, 7, 6, 3, 2, 1, 4, 4, 7, 4, 3, 4, 9, 3, 0, 3, 4, 3, 7, 1, 9, 9, 0, 6, 1, 0, 6, 7, 4, 7, 6, 6, 4, 3, 4, 6, 1, 9, 1, 2, 4, 4, 6, 2, 9, 3, 5, 9, 9, 1, 5, 2, 8, 4, 5, 4, 4, 0, 8, 2, 6, 9, 0, 5, 7, 7, 9, 2, 1, 8, 8, 7, 0, 9, 8, 1, 9, 2, 4, 6, 7, 6, 7, 8, 1, 0, 0, 1, 4, 5, 5, 6, 2, 6 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

See A201936 for a guide to related sequences.  The Mathematica program includes a graph.

LINKS

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

EXAMPLE

x=1.147757632144743493034371990610674766434...

MATHEMATICA

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

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

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

r = x /. FindRoot[f[x] == g[x], {x, 1.1, 1.2}, WorkingPrecision -> 110]

RealDigits[r]  (* A201940 *)

CROSSREFS

Cf. A201936.

Sequence in context: A271026 A093582 A275639 * A075113 A197739 A277577

Adjacent sequences:  A201937 A201938 A201939 * A201941 A201942 A201943

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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 19 16:37 EST 2019. Contains 329323 sequences. (Running on oeis4.)