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Requires options -rprime.
-rprime
->n{n.prime?&&[n&[n-2,n+2].any?(&:prime?)}
Try it online!Try it online!
->n{n.prime?&&[n-2,n+2].any?(&:prime?)}
Try it online!
->n{n.prime?&[n-2,n+2].any?(&:prime?)}
