What's the notation for writing a number as its digits Hoping this is a simple question, I'm pretty certain this is covered in number theory, but I haven't had much time to pour through my number theory book. I'm wondering what the notation for writing an integer as its digits is. 
For example, given $435$ is it something like $4|3|5$?
Thanks 

I think you're looking for something like $\overline{ABCD}$ as a shorthand for $1000A+100B+10C+D$. I see this notation used sometimes in problems dealing with a number's digits.
