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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A298853 Decimal expansion of the greatest real zero of x^4 - 2*x^2 - x - 1. 2
1, 7, 1, 0, 6, 4, 4, 0, 9, 5, 0, 4, 5, 0, 3, 2, 9, 3, 5, 9, 9, 0, 6, 3, 4, 1, 6, 3, 3, 3, 5, 8, 5, 9, 4, 5, 6, 3, 3, 1, 5, 6, 0, 9, 8, 5, 5, 9, 2, 4, 8, 5, 4, 4, 7, 8, 6, 1, 1, 6, 8, 7, 5, 8, 2, 3, 6, 1, 7, 0, 0, 6, 8, 0, 7, 8, 9, 0, 4, 9, 9, 7, 5, 3, 8, 2 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Let (d(n)) = (2,1,2,1,2,1,...), s(n) = (s(n-1) + d(n))^(1/2) for n > 0, and s(0) = 1.

Then s(2n) -> 1.9263032199..., as in A298852;

s(2n+1) -> 1.710644095..., as in A298853.

LINKS

Clark Kimberling, Table of n, a(n) for n = 1..10000

EXAMPLE

Greatest real zero = 1.710644095...

MATHEMATICA

r = x /. NSolve[x^4 - 2 x^2 - x  - 1 == 0, x, 10000][[4]];

RealDigits[r][[1]]; (* A298853 *)

RealDigits[Root[ x^4-2*x^2-x-1, 2], 10, 120][[1]] (* Harvey P. Dale, May 23 2019 *)

CROSSREFS

Cf. A298852.

Sequence in context: A179376 A152447 A198611 * A198212 A217245 A154098

Adjacent sequences:  A298850 A298851 A298852 * A298854 A298855 A298856

KEYWORD

cons,nonn,easy

AUTHOR

Clark Kimberling, Feb 13 2018

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 October 19 03:54 EDT 2019. Contains 328211 sequences. (Running on oeis4.)