Euler's Totient Rule
The number of bases mod 
in which 
has cycle length 
is the same as the number of Fractions
, 
, ..., 
which have least Denominator .
References
Conway, J. H. and Guy, R. K. The Book of Numbers. New York: Springer-Verlag, pp. 167-168, 1996.
- Goodstein's Theorem
- Googol
- Googolplex
- Gordon Function
- Gorenstein Ring
- Gosper Island
- Gosper's Algorithm
- Gosper's Method
- Graceful Graph
- Graded Algebra
- Gradian
- Gradient
- Gradient Four-Vector
- Gradient Theorem
- Graeco-Latin Square
- Graeco-Roman Square
- Graeffe's Method
- Graham's Biggest Little Hexagon
- Graham's Number
- Gram-Charlier Series
- Gram Determinant
- Gram Matrix
- Gram-Schmidt Orthonormalization
- Gram Series
- Gram's Inequality