I don't think I have OCD. Although my sister is obsessed with even numbers. She has set the options on the T.V and most things in the house so when you turn up the volume it goes up in two's and if it is on a odd number it will go to a even number.
Personally I like prime numbers, and numbers that are in the fibonachi sequence. So I like the number
3- it is the lowest in the fibonacci sequence that is a prime number.
7654090467756936378415884538348976340768064993978954512095813<----that is the 293rd number in the fibonacci sequence.
and 293 is a prime number