Gregory number
In
James Gregory, is a real number of the form:[1]
where x is any rational number greater or equal to 1. Considering the
arctangent
, we have
Setting x = 1 gives the well-known
Leibniz formula for pi
. Thus, in particular,
is a Gregory number.
Properties
See also
References
- R. K. Guy (1996). The Book of Numbers. New York: Copernicus Press. pp. 241–243.