My rule of thumb is one factor of three and then as many factors of two as you need. Adding five is not much different from two twos or a two and a three. Ditto

My rule of thumb is one factor of three and then as many factors of two as you need. Adding five is not much different from two twos or a two and a three. Ditto for seven. The only downside imo is not having ten(s) be a balanced deploy number.