Hello, Excellers welcome back for another blog post in my 2019 series where I share my **#FormulaFriday #Excel** tips. Today let’s look at a really handy Excel formula or a number of formulas that will tell us what numbers are missing in a sequenced data set. Cool huh?. Let’s get writing that formula.

We are going to use a number of Excel formulas. We will begin with the logical **IF Function**. Here is my sample data set. I can clearly see that some of the numbers from 1 to 20 missing. But just which ones?.

### Starting With The IF Function.

We start our formula with the **IF Function** which will test if a condition is met returning one value for TRUE and another for FALSE. We will need to test if we find an error (#N/A) or not. Which is why we first then use the **ISNA Function** which checks if a value is #N/A and returns TRUE or FALSE. So here is the first part of our formula set up.

### Bring In The VLOOKUP Function.

Next, we take the **VLOOKUP Function** to lookup the ROW number that relates to cell A1 (which returns the value 1) in the list of values that are in cells A1 to A20. We are looking to see if the VLOOKUP returns #N/A.

### Finishing The IF Function.

We now specify if what Excel needs to display in the cell if the row number is not found. This is the ‘value if true’ part of the **IF Function**. We specify that we find #N/A then Excel must return the row number.

If the result of the **VLOOKUP Function** is not #N/A and the row number is found then we simply get Excel to return a blank cell using the double quotes ” “.

### Dragging The Formula.

So, my final stage of the formula is to simply drag the formula to row 20 to allow Excel to see what rows up to and including 20 are missing. Sweet. How cool is that?. See the results below. Excel has identified exactly which of the values are missing. Have you used this method before or another way?. Share in the comment below. Would you use MATCH Function or how about some Excel VBA code?.

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