Brahmagupta's Problem
Solve the Pell Equation
in Integers. The smallest solution is
, 
.See also Diophantine Equation, Pell Equation- Antimagic Graph
- Antimagic Square
- Antimorph
- Antimorphic Number
- Antinomy
- Antiparallel
- Antipedal Triangle
- Antipersistent Process
- Antipodal Map
- Antipodal Points
- Antipode
- Antiprism
- Antiquity
- Antisnowflake
- Antisquare Number
- Antisymmetric
- Antisymmetric Matrix
- Antisymmetric Relation
- Antisymmetric Tensor
- Antoine's Horned Sphere
- Antoine's Necklace
- Apeirogon
- Apoapsis
- Apocalypse Number
- Apocalyptic Number