Anyways

I have a list with a lot of numbers and I would liek to find the patern of those numbers do I can do a number generator with that patern (or aglorithm).

I made a program to put the number in orders, but cant think which code I need to use to find a patern.

The numbers are in TXT file, so can someone please post here a source code which can find that patern (tell me where I have to put the input file (file with the numbers).

Oh yea I forgot to tell you, the numbers are done with 13 character each (0 to 9) and they are separated with - after the 4 character and the 9 one.
example: 3245-42517-7522

Thank you.