Least Common Multiple

In arithmetic and number theory, the least common multiple or lowest common multiple (lcm) or smallest common multiple of two integers a and b is the smallest positive integer that is a multiple both of a and of b. Since it is a multiple, it can be divided by a and b without a remainder. If either a or b is 0, so that there is no such positive integer, then lcm(a, b) is defined to be zero.

The definition is sometimes generalized for more than two integers: The lowest common multiple of integers a₁, ..., a_n is the smallest positive integer that is a multiple of a₁, ..., a_n.

Description by Wikipedia