Microsoft Excel: How to Find Missing Numbers in a Sequence. You can easily find missing numbers in a sequence with Excel. Jupiterimages/Photos. Getty Images. Locating missing sequential numbers can be an arduous task when working with long lists of data. For example, you might want to locate business check numbers that haven't been logged into a balance sheet, or maybe you need to find missing product IDs. Manually searching the list is tedious and prone to oversight. Excel offers conditional formatting for locating gaps but this does not provide a list of missing numbers. The solution lies with using Excel's array feature to traverse a data list automatically and extract missing sequential numbers, even if the number list is out of order. Open your spreadsheet in Microsoft Excel and look at the numbers list. ![]() You need to determine the range of numbers you wish to consider.This range might be based on the lowest and highest values in the number list or some known range. Mcafee Antivirus Plus 2011 Serial Mom on this page. For example, if the last check number you logged into a balance sheet last year was 8. Click the first cell in an empty column, hold the "Shift" key and click the last data cell in that column. This selects all cells between those two points. You need at least as many cells selected as the anticipated number of missing values. The easiest way to guarantee you select enough cells is to select the number of cells equal to the range difference. In the example, subtracting 8. By selecting cells "1" through "2. Type the following code: =SMALL(IF(COUNTIF(B: B,ROW($B$8. B$1. 18. 59))=0,ROW($B$8. B$1. 18. 59),""),ROW()) Column "B" refers to the number list, and the row numbers refer to the data range, so this example searches the "B" column for numbers 8. . Press "Ctrl- Shift- Enter" to enter the typed formula as an array.If you just press "Enter," the formula will not work.Tip. This formula reassesses the data list every time you input new data, so the output list is constantly updated.Warning. When the array runs out of missing sequential values, a #NUM!" error will be displayed in the remaining selected cells.These errors can be safety ignored.Photo Credits. Jupiterimages/Photos. Create a step chart using dynamic names instead of duplicated data. Join us at the Microsoft Data Insights Summit, a user conference for business analysts. Expand your skills and discover new tools and capabilities to solve your most. Excel macros and usage notes to help beginners and fairly advanced users work with Excel spreadsheets. -- David McRitchie (over 200 Excel web pages). How about including zero in the examined range, but not counted? From the above example, 1,3,0,1,0, Zero(0) works like a bridge, but not counted(skipped).
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