Rational $D(q)$-quintuples

Goran Dražić

For a nonzero rational number $q$, a rational $D(q)$-$n$-tuple is a set of $n$ distinct nonzero rationals $\{a_1,a_2,\dots ,a_n\}$ such that $a_i{a}_j+q$ is a square for all $1 \le…