f(lcm/2)

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- Reference manual
  - Built-in Predicates
    - Arithmetic
      - General purpose arithmetic
        
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- Packages

Availability:Arithmetic function (see is/2)

lcm(+IntExpr1, +IntExpr2)

Result is the least common multiple of IntExpr1, IntExpr2.^{bugIf the
system is compiled for bounded integers only lcm/2
produces an integer overflow if the product of the two expressions does
not fit in a 64 bit signed integer. The default build with unbounded
integer support has no such limit.} If either expression evaluates to zero the LCM is zero.