I have one more to add to the list. Tesla, for some odd reason, had an obsession where everything had to be divisible by 3. For example, when he got a hotel room, the room number had to be divisible by 3, or he would not stay in it, stuff like that. Anyway, Sheldon, in a recent episode, makes a video to his future self. In the video he mentioned how his apartment had to be at 72 degrees Fahrenheit, nothing else, and if he didn't like that to put on a blanket because it has to be 72 and 72 is the the best. Anyway, this got my attention because 72 is divisible by 3.