1) a factorization function
2) a function to get the exponents appearing in a factorization
3) the number of divisors function
4 set operation functions.
It is our understanding that these type of functions are not in the WebWork macros typically loaded at the beginning
We use the functions in several different problems, and don't want to have to include the code in all of them.
For our own purposes we can put the functions in a local directory and load them. But, if we create a library for others to use they may encounter difficulties setting up their own local directory for the perl code.
Mike O'Sullivan, Tom Schmidt