Diophantus of Alexandria/Arithmetica/Book 3
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Problems by Diophantus of Alexandria: Arithmetica Book $\text {III}$
Problem $6$
To find $3$ numbers such that their sum is a square and the sum of any pair of them is a square.
That is, let $\set {p, q, r}$ be a set of $3$ natural numbers such that:
What are those $3$ numbers?
Problem $12$
To find $3$ numbers such that the product of any $2$ of them added to the $3$rd gives a square.
That is, let $\set {p, q, r}$ be a set of $3$ natural numbers such that:
What are those $3$ numbers?