Sticking with the No-Code standard, this UDA enables you to generate a random number based on the parameters you input.
Once you have downloaded the UDA below and published it, you'll be able to use it any of your workflows. Simply drag the UDA onto the workflow open it up and put in the value you want and a variable to store the random number.
Nintex Workflow 2013
SharePoint Server 2013
|Its not too complex. I have also created a workflow that runs a Loop action that iterates 20 times. Inside is a Math Calculation that increments the number for the Loop and the UDA that generates the random number. Finally, a Log action that logs the random number|