Formula to generate serial numbers needed

I need a formula that will generate a list of serial numbers when the first and last number number is entered into a cell.
Example:
first number is SERN012345 and last is SERN98765 will generate rows of numbers like SERN012345,SERN012346,SERN012347..etc.
I know I can drag and populate but we need the comma between each number.
If a custom cell format will do the same thing?