5 % i = 0, 0 < i, 1 < i, i * i ≤ 5, 3 ≤ i ⊦ i = 2
5 % i = 0, 0 < i, 1 < i, i * i ≤ 5 ⊦ i = 2, 3 ≤ i
Used formulas: 3 ≤ i