Pépin's Theorem
The Fermat Number 
is Prime Iff
See also Fermat Number, Pépin's Test, Selfridge-Hurwitz Residue
- Cushion
- Cusp
- Cusp Catastrophe
- Cusp Form
- Cusp Map
- Cusp Point
- Cutting
- Cut-Vertex
- CW-Approximation Theorem
- CW-Complex
- Transfinite Diameter
- Transfinite Number
- Transform
- Transformation
- Transitive
- Transitive Closure
- Transitive Reduction
- Transitivity Class
- Translation
- Translation Relation
- Transpose
- Transpose Map
- Transposition
- Transposition Group
- Transposition Order