I need to know the formula to create a column of random 8 character ID
numbers, preferably with a set prefix of 3 numbers. I'd be REALLY happy if
I could create it with random text and numerals, but it doesn't have to be.

(where 123 is the constant)
i.e.:
12386756
12337288
12378645
12321356

or

123g568e
1237t7er
12397u23

Thanks in advance for your help.

Kenny