Maths — Prime vs Square Numbers
Two disjoint sets of positive integers.
Make it your own.
title "Prime numbers vs square numbers"
set P "Prime numbers"
set S "Square numbers"
only "P" "2, 3, 5, 7, 11, 13 (exactly two factors)"
only "S" "1, 4, 9, 16, 25 (n squared)"
intersect "P,S" "Empty: any square above 1 has more than two factors"