Hi Paul!
I have the same idea as Anthony had: numbering every second page with consecutive numbers, aka foliating.
I tried both of your formula, however neither has worked: my ms word comes with syntactical error message.
Unfortunately I did not find any useful information about programming field codes (e.g. none of the sources know the function(?) mod() and int() outside of excel and noone mentions the modificator \#, but \* only.)
So, I'd like to ask your kind help to update your formula to the need of Word 2021.
Thanks!
Greg