Definition:Diophantine m-Tuple
Definition
A Diophantine $m$-tuple set of $m$ positive integers such that the product of any $2$ of them plus $1$ is a square number.
Particular Instances
Diophantine Triple
A Diophantine triple is a Diophantine $m$-tuple where $m = 3$.
That is, a Diophantine triple is a set of $3$ positive integers such that the product of any $2$ of them plus $1$ is a square number.
Diophantine Quadruple
A Diophantine quadruple is a Diophantine $m$-tuple where $m = 4$.
That is, a Diophantine quadruple is a set of $4$ positive integers such that the product of any $2$ of them plus $1$ is a square number.
Diophantine Quintuple
A Diophantine quintuple is a Diophantine $m$-tuple where $m = 5$.
That is, a Diophantine quintuple is a set of $5$ positive integers such that the product of any $2$ of them plus $1$ is a square number.
Source of Name
This entry was named for Diophantus of Alexandria.
Sources
- 2015: Yifan Zhang and G. Grossman: On Diophantine triples and quadruples (Notes on Number Theory and Discrete Mathematics Vol. 21, no. 4: pp. 6 – 16)