I agree with the first answer on this one, posted by middleman.
I do this very often when creating a new sheet. I put the word "Reset" in cell A1 and number from A2 to about A10000. Then I hide the column. If I add rows, I just unhide it and re-number the cells.
This way if someone in my office ends up looking at the sheet and sorting the data, I can get back to where I left it.
