6.5.3  The least common multiple: lcm

The lcm command finds the least common multiple (LCM) of a set of integers or polynomials. (See also Section 6.28.8 for polynomials.)

With one argument:

• lcm takes one argument:
  seq, a sequence or list of integers or polynomials.
• lcm(seq) returns the LCM of the elements of s.

Examples.

• Input:
  lcm(18,15)
  Output:

  90

• Input:
  lcm(-5-12*i,11-10*i)
  Output:

  −53+8 i

• Input:
  lcm(18,15,21,36)
  Output:

  1260

• Input:
  lcm([18,15,21,36])
  Output:

  1260

With two arguments:

• lcm takes two arguments:
  s and t, two lists of the same length containing integers or polynomials (alternatively, a matrix m with two rows whose elements are integers or polynomials).
• lcm(s,t) (or lcm(m)) returns the list whose kth element is the LCM of the kth elements of s and t (or the kth column of m).

Example.
Input:

or:

Output: