Home / \( I(4) = I(3) + I(2) + I(1) = 4 + 2 + 1 = 7 \equiv 0 \mod 7 \)\( I(4) = I(3) + I(2) + I(1) = 4 + 2 + 1 = 7 \equiv 0 \mod 7 \)February 22, 2026