j2 / gcd(i2, j2) = 1, 0 ≤ gcd(i2, j2), j2 ≥ 0 ⊦ gcd(i2, j2) = j2
j2 / gcd(i2, j2) = 1, 0 ≤ gcd(i2, j2) ⊦ gcd(i2, j2) = j2, j2 ≥ 0
Used formulas: j2 ≥ 0