I am trying to write code that will look throught a spreadsheet and find a
break in a sequential field. i.e. , 2, 3, 5

Once the break is fouind I would place a blank line between these and
continue until I reach the end of the file

I know how to place the blank line and know how to find the end of the file,
I just can't figure the code for finding the breaks in the numbers.