load of old bollocks. you only remember the 'bad' things associated with those numbers because you have been brought up with 666 as 'bad', or 13 as 'unlucky' etc.
If you were told from a young age 11 is 'unlucky' and 777 is 'bad', you'd notice and remember if something 'bad' or 'unlucky' happened related to those numbers.
As for other 'bad luck' and 'good luck' stuff like black cats...
https://en.wikipedia.org/wiki/Self-fulfilling_prophecy
Though I suspect you're on a bit of a wind up with this thread ;-)