Microsoft Excel: How to Find Missing Numbers in a Sequence. Locating missing sequential numbers can be an arduous task when working with long lists of data. For example, you might want to locate ...

This is because SEQUENCE is a dynamic array function that produces a spilled array, and Excel tables aren't compatible with results generated in this way.

You can add a column in Excel by right-clicking or using the “Insert” option. These features are helpful for adding new data to a spreadsheet.