Gregory Number
A number
where
is an Integer or Rational Number, 
is the Inverse Tangent, and 
is the Inverse Cotangent. Gregory numbers arise in the determination of Machin-Like Formulas.Every Gregory number 
can be expressed uniquely as a sum of 
s where the 
s are Stérmer Numbers.
References
Conway, J. H. and Guy, R. K. ``Gregory's Numbers'' In The Book of Numbers. New York: Springer-Verlag, pp. 241-242, 1996.
- Gauss-Bonnet Formula
- Gauss-Bonnet Theorem
- Gauss Equations
- Gaussian Approximation Algorithm
- Gaussian Bivariate Distribution
- Gaussian Brackets
- Gaussian Coefficient
- Gaussian Coordinate System
- Gaussian Curvature
- Gaussian Differential Equation
- Gaussian Distribution
- Gaussian Distribution Linear Combination of Variates
- Gaussian Elimination
- Gaussian Function
- Gaussian Hypergeometric Series
- Gaussian Integer
- Gaussian Integral
- Gaussian Integral (Linking Number)
- Gaussian Joint Variable Theorem
- Gaussian Mountain Range
- Gaussian Multivariate Distribution
- Gaussian Polynomial
- Gaussian Prime
- Gaussian Quadrature
- Gaussian Sum