This logic is not apply here because application numbers are not being issued in sequence, see below examples,
My AR Sep11, 2020 - Application No 4367
Friend 1, AR is Nov 16, 2020, AOR Dec 23, 2021, Application No 4100
Friend 2, AR is August 20, 2020, AOR April15, 2021, Application No 4160
So I am unable to understand sequence of Application no