⊦ ≡mod(i, i0, j) ↔ j | abs(i - i0)
≡mod(i, 1, j), ≡mod(i, 1, j0), prime(j), prime(j0), 0 < i ⊦ j = j0, j * j0 | abs(i - 1)
Used terms: j * j0, 1, i