Excludent Factorization Method
Also known as the difference of squares. It was first used by Fermat 
and improved by Gauß. Gausslooked for Integers 
and 
satisfying
for various moduli
. This allowed the exclusion of many potential factors. This method works best when factors areof approximately the same size, so it is sometimes better to attempt 
for some suitably chosen value of 
.See also Prime Factorization Algorithms- Annulus Conjecture
- Annulus Theorem
- Anomalous Cancellation
- Anomalous Number
- Anonymous
- Anosov Automorphism
- Anosov Diffeomorphism
- Anosov Flow
- Anosov Map
- ANOVA
- Anthropomorphic Polygon
- Anthyphairetic Ratio
- Antiautomorphism
- Anticevian Triangle
- Antichain
- Anticlastic
- Anticommutative
- Anticommutator
- Anticomplementary Triangle
- Antiderivative
- Antidifferentiation
- Antigonal Points
- Antihomography
- Antihomologous Points
- Antilaplacian