List int to manageable filename

I need ideas for converting list int or list string to a manageable string that can be attached to a filename to give the filename a unique identifier.

The Lists would be fairly short, no more than 30 at a time, and the string/int would all be an integer when converted.

I was thinking base32 or base64 with removing ineligible characters for a file name, however I was wondering if there are better ways to go about this.