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A116425 Decimal expansion of 2 + 2*cos(2*Pi/7). 4
3, 2, 4, 6, 9, 7, 9, 6, 0, 3, 7, 1, 7, 4, 6, 7, 0, 6, 1, 0, 5, 0, 0, 0, 9, 7, 6, 8, 0, 0, 8, 4, 7, 9, 6, 2, 1, 2, 6, 4, 5, 4, 9, 4, 6, 1, 7, 9, 2, 8, 0, 4, 2, 1, 0, 7, 3, 1, 0, 9, 8, 8, 7, 8, 1, 9, 3, 7, 0, 7, 3, 0, 4, 9, 1, 2, 9, 7, 4, 5, 6, 9, 1, 5, 1, 8, 8, 5, 0, 1, 4, 6, 5, 3, 1, 7, 0, 7, 4, 3, 3, 3, 4, 1, 1 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The real root of the equation x^3 - 5*x^2 + 6*x - 1 = 0. - Arkadiusz Wesolowski, Jan 13 2016

REFERENCES

Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, Section 5.25 Tutte-Beraha Constants, p. 417.

LINKS

Table of n, a(n) for n=1..105.

Eric Weisstein's World of Mathematics, Logistic Map

Eric Weisstein's World of Mathematics, Silver Constant

EXAMPLE

3.246979603717467061...

MATHEMATICA

First@ RealDigits[N[2 + 2 Cos[2 Pi/7], 120]] (* Michael De Vlieger, Jan 13 2016 *)

PROG

(PARI) 2 + 2*cos(2*Pi/7) \\ Michel Marcus, Jan 13 2016

CROSSREFS

Cf. A231187.

Sequence in context: A138245 A163328 A164109 * A019653 A240493 A095258

Adjacent sequences:  A116422 A116423 A116424 * A116426 A116427 A116428

KEYWORD

nonn,cons,easy

AUTHOR

Eric W. Weisstein, Feb 15 2006

STATUS

approved

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Last modified February 13 01:52 EST 2016. Contains 268229 sequences.