my friend m also searching for answer to this question from soo long......
m kinda haunted by 717 , 747 n 127....... whoooo most of the time they turn up on the clock when i see time or on the licence plates of the cares moving in the front and all...!
Maybe this link will be of help to you:
i will now. thanks. but seriously, did you ever see the movie Pi? they explain why you see certain numbers, and where some of them may come from... but if you aren't interested in numerology or mathematics and are just superstitious, i bet you already have your own theory
What about 23?!
Maybe it is a premonition of some sort....are you psychic?