Formula to shift numbers in a column

I have a column called "Priority" that has my tasks (rows) ranked by importance, with 1 being the top priority and 10 being the lowest priority. When I check off a task I want to delete 1 from the most important task and have that 1 replace that task that is numbered "2". Is there a formula to do this?

Something like if 1 doesn't exist/is deleted, then 2 = 1, 3 = 2, 4 =3, etc. etc.

Thanks in advance!


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