I don't think this really fits with what you're talking about but I have always had this obsession with the numbers 2, 3, 5, and 8. It has nothing to do with seeing them on the clock or anywhere else, it's what I use in my day to day life. Kinda hard to explain but, like, when I change the pets water, I will rinse and dump it 3 times then fill it again and give it to them. I will put 2 seconds of creamer in my coffee. I will shuffle the cards 8 times, etc. It's always those numbers I stick to and always have. I don't really think it's OCD because it doesn't interfere with my life. It's just a little quirk I guess.