My professor has given a sequence of N numbers as a1, a2, ..., aN and asked me to find the smallest possible value of ai * aj such that it is a prime number, where 1 <= i < j <= N.
If it's possible to find any value of ai * aj such that it is a prime number, then print the smallest value of such ai * aj, otherwise print -1.
x=[1 2 3] y = 2
x=[5 5 5 2] y = -1
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