https://sc.edu/uofsc/posts/2022/10/conversation_thirteen.php
https://people.howstuffworks.com/question614.htm
https://en.wikipedia.org/wiki/13_(number)#Luck
It's not just on a Friday, because the 13th can be on any day of the week.
https://desertshapes.blogspot.com/search?q=Numbers+and+Patterns