OFFSET
1,2
COMMENTS
In a regular pentagon this is the distance between a vertex and the midpoint of the opposite side in units of the radius of the circumscribing circle.
FORMULA
EXAMPLE
1.809016994374947424102293417182819058860154589902881431067724311352630231409451...
MATHEMATICA
RealDigits[(5 + Sqrt[5])/4, 10, 111][[1]] (* Robert G. Wilson v, Jan 14 2018 *)
PROG
(PARI) (5 + sqrt(5))/4 \\ Michel Marcus, Jan 08 2018
CROSSREFS
KEYWORD
AUTHOR
Wolfdieter Lang, Jan 08 2018
STATUS
approved