OFFSET
1,1
COMMENTS
An algebraic number with minimal polynomial x^4 - 6x^2 + 4. - Charles R Greathouse IV, Mar 25 2014
The rhombus with diagonals phi*sqrt(2) and sqrt(2) is the unique golden rhombus -- by definition, the ratio of the diagonals of a golden rhombus is phi -- whose area is also phi (the golden ratio). - Rick L. Shepherd, Apr 10 2017
LINKS
Ivan Panchenko, Table of n, a(n) for n = 1..1000
MathWorld, Golden Rhombus
EXAMPLE
2.28824561127073719...
MATHEMATICA
RealDigits[GoldenRatio Sqrt[2], 10, 120][[1]] (* Harvey P. Dale, Jan 24 2016 *)
PROG
(PARI) sqrt(3+sqrt(5)) \\ Charles R Greathouse IV, Mar 25 2014
(Magma) SetDefaultRealField(RealField(100)); R:= RealField(); Sqrt(2)*(1 + Sqrt(5))/2; // G. C. Greubel, Sep 27 2018
CROSSREFS
KEYWORD
cons,nonn
AUTHOR
N. J. A. Sloane, Jun 15 2004
STATUS
approved