# Formula to add missing numbers in a given sequence.

#### MarkPD

##### New Member
Hi everyone,

I'm just a beginner Excel user and spend time reading and searching Excel formulas available online, so please bear my naivety. I'm creating a table in which it can list the missing numbers in a column. I'm using a series of numbers found in the official receipt for example, for my data. I've found an array that made that possible =SMALL(IF(ISERROR(MATCH(\$T\$3+ROW(OFFSET(\$T\$3, 0,0, \$T\$4-\$T\$3-1))-2, \$T\$3:\$T\$4,0)), \$T\$3+ROW(OFFSET(\$T\$3,0, 0, \$T\$4-\$T\$3-1))-2), ROW(A1)) ,though I can't locate the website where I got the array so I do apologize. Now I want to extract the non-duplicate numbers in a different column for tracking purposes in which I can't figure out a way to do it. I am humbly asking for assistance from the expert here to help me complete this. Thank you in advance.

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#### Fluff

##### MrExcel MVP, Moderator
You're welcome & thanks for the feedback.

### Excel Facts

What is =ROMAN(40) in Excel?
The Roman numeral for 40 is XL. Bill "MrExcel" Jelen's 40th book was called MrExcel XL.

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