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A335863 Decimal expansion of the negative of the zero x2 of the cubic polynomial x^3 - 2*x^2 - 10*x - 6. 2
1, 7, 5, 2, 5, 1, 7, 8, 2, 1, 9, 2, 9, 8, 1, 6, 8, 1, 8, 4, 8, 9, 8, 3, 9, 2, 1, 2, 4, 3, 7, 3, 1, 0, 0, 2, 7, 9, 5, 2, 5, 9, 0, 9, 8, 8, 6, 0, 6, 0, 3, 1, 1, 3, 3, 7, 8, 5, 1, 4, 2, 7, 6, 0, 4, 8, 4, 9, 9, 7, 7, 8, 1, 3, 9, 9, 0, 6, 2, 2, 5, 9, 7, 2, 9, 5, 7, 4, 9, 0, 8, 4, 6, 2, 5, 3, 4, 4, 8 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

For details and links see A335862.

LINKS

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

FORMULA

-x2 = (1/3)*(2 - (1/2)*(1 - sqrt(3)*i)*(179 + 3*sqrt(3)*sqrt(269)*i)^(1/3) - (1/2)*(1 + sqrt(3)*i)*(179 - 3*sqrt(3)*sqrt(269)*i)^(1/3)), where i is the imaginary unit.

EXAMPLE

-x2 = 1.7525178219298168184898392124373100279...

CROSSREFS

Cf. A335862 (x1), A335864 (-x3).

Sequence in context: A258370 A135537 A212038 * A112545 A021934 A021097

Adjacent sequences:  A335860 A335861 A335862 * A335864 A335865 A335866

KEYWORD

nonn,cons,easy

AUTHOR

Wolfdieter Lang, Jun 29 2020

STATUS

approved

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Last modified September 28 05:33 EDT 2020. Contains 337392 sequences. (Running on oeis4.)