Pépin's Theorem
The Fermat Number 
is Prime Iff
See also Fermat Number, Pépin's Test, Selfridge-Hurwitz Residue
- Estimator
- Eta Function
- Et-Function
- Ethiopian Multiplication
- Etruscan Venus Surface
- Eubulides Paradox
- Euclidean Algorithm
- Euclidean Construction
- Euclidean Geometry
- Euclidean Group
- Euclidean Metric
- Euclidean Motion
- Euclidean Norm
- Euclidean Number
- Euclidean Plane
- Euclidean Space
- Euclid Number
- Euclid's Axioms
- Euclid's Elements
- Euclid's Fifth Postulate
- Euclid's Postulates
- Euclid's Principle
- Euclid's Theorems
- Eudoxus's Kampyle
- Euler Angles