7 % i = 0, 1 < i, 0 < i, i * i ≤ 7, 3 ≤ i ⊦
7 % i = 0, 1 < i, 0 < i, i * i ≤ 7 ⊦ 3 ≤ i
Used formulas: 3 ≤ i