j * j * j ≤ j ^ i, j ^ i / 3 < j, 2 ≤ j, 2 < i, 0 ≤ j, 0 < j, 0 < i, 1 < i ⊦
j ^ i / 3 < j, 2 ≤ j, 2 < i, 0 ≤ j, 0 < j, 0 < i, 1 < i ⊦ j * j * j ≤ j ^ i
Used formulas: j * j * j ≤ j ^ i