I do not know why you call triskaidekaphobia a superstitious phobia, calling it just a phobia is enough.

Superstitious is usually used when some sees an old action as being without reason. However, too many times has a reason been shown later. Enough so that i would never use the word.

There is a lot more meaning in numbers then we give any credence to. I am sure that future of mathematics will be understanding these meanings.