If it would be like 1,3,7,9,13,14,15,16,18,20 then you can create a list of
numbers 1 to 20 (assume they are in A1:A20), then adjacent to that list use
a formula like
=IF(ISNUMBER(MATCH(A1,MySequence,0)),"",A1)
where MySequence is the list you want to check, copy down to B20
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