Add lcm function

[Former user]

When you need the least common multiple, you have to type the formular from the function documentation:

lcm(n1; n2) = n1 * n2 / gcd(n1; n2)

This is annoying when you need lcm again and again. As it is a common math operation as greatest common divisor, add lcm please to the speedcrunch functions.

Cheers

[Helder Correia]

You can simply define your own user function: http://speedcrunch.org/userguide/advanced.html#user-functions