Wow. Some of my designs could really use some work in some of these categories o hadn't even thought of! For the units though, there are the Practical Numbers,

Wow. Some of my designs could really use some work in some of these categories o hadn't even thought of! For the units though, there are the Practical Numbers, and the 5-smooth numbers, that more people should be aware of. They include a lot of the really popular numbers that show up everywhere