13 seems to be important.

Perhaps the number 13 is so important and so relevant that [they] had to create a mass formation psychosis around it called superstition such that it needed to be removed from elevators. Evil fooks robbing us of our God given synchronicity with the universe and each other. 13(28 day) + 1 day just feels right and it lines up with a woman's menstrual cycle which confirms it in my book.