设\(a=p_1^{a1}p_2^{a2}p_3^{a3}... b = p_1^{b1}p_2^{b2}p_3^{b3}\)，联想唯一分解定理，则\(lcm(a, b) = p_1^{max(a1,b1)}p_2^{max(a2,b2)}p_3^{max(a3,b3)}...\)
