formula for find missing numbers from column A

[AaruJaan]

Hi Experts,
I have file with numbers in Column A, I want formula in column B which numbers missing in column A they will show in column B, I think if you see screenshot you will understand what I trying to say.

Thanks in Advance.
G

[wyowhite]

The attached should solve The formula is arry so use CTL +shift+enter

[Sam Capricci]

for anyone interested, this is the formula wyowhite provided in post #2... =SMALL(IF(COUNTIF(A:A,ROW($A$8001:$A$80020))=0,ROW($A$8001:$A$80020),""),ROW())
an array formula activated using ctrl/shift/enter.

wyowhite, although it isn't a forum rule it is considered good to also post your solution in the post as many cannot download workbooks d/t firewall issues or want to download them as they could be useless to them anyway. This way someone searching for a similar issue can view your solution to see if it might work for them.

BTW, nice solution.

[AaruJaan]

Hi Sambo Kid, formula is not working for me.

[Sam Capricci]

Did you open wyowhite’s attachment? Did you activate it using ctrl/shift/enter? It works fine in there.

[AaruJaan]

yes I have used clt/shift/enter

[Sam Capricci]

Ok, I tried it in your attachment, had to start it in cell B1 but pasted this =SMALL(IF(COUNTIF(A:A,ROW($A$80001:$A$80020))=0,ROW($A$80001:$A$80020),""),ROW())
then activated it with ctrl/shift/enter and it worked fine for me.
I did have to adjust wyowhite's range as he started it at 8001 and not 80001 but after that it worked fine for me.

[Sam Capricci]

I changed the formula so you can use it beginning in cell B3, make it this... =SMALL(IF(COUNTIF(A:A,ROW($A$79999:$A$80020))=0,ROW($A$79999:$A$80020),""),ROW()) with ctrl/shift/enter and it will work.

[kvsrinivasamurthy]

In D3 then copy down till blank cell appears.
COUNTIF formula is slower. MATCH is faster.
Array formula

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[FlameRetired]

The attached should solve The formula is arry so use CTL +shift+enter

Sorry for off-topic interjection:

Although there is no official rule regarding this behavior, we request that wherever possible both the question AND the answer be provided in substantive detail here within the thread. An attached workbook is an excellent aid for posing a question and offering a solution, but solely doing that with no in thread explanation makes it difficult for researchers to understand or consider the Q & A of this thread without downloading what may be a pointless doc to them, if they can do that at all. Doing that also hides the content from search engines so others may never benefit from this.

I'm sure you understand, and we look forward to seeing you post your formulas/macros in your posts for the searching benefit of all.

Thanks again for all your hard work here!