Thread:Swampcloud51/@comment-38701854-20190627180512/@comment-33229352-20200118230954

It's the same reason some hotels don't have a 13th floor button in their elevators. It goes from 12 to 14 despite it actually being the 13th floor. Just having a number can be considered bad luck. Some people believe that saying or thinking about certain numbers is enough to conjure or invite what they're trying to avoid.