How do I find a missing number in a sequence of numbers?

Looking for a function or formula that will identify a missing number in a
range of cells containing a sequence of numbers.

Can anyone help?

If it would be like 1,3,7,9,13,14,15,16,18,20 then you can create a list of
numbers 1 to 20 (assume they are in A1:A20), then adjacent to that list use
a formula like

=IF(ISNUMBER(MATCH(A1,MySequence,0)),"",A1)

where MySequence is the list you want to check, copy down to B20

--
Regards,

Peo Sjoblom

(No private emails please)


"Nash" <[email protected]> wrote in message
news:[email protected]...
> Looking for a function or formula that will identify a missing number in a
> range of cells containing a sequence of numbers.
>
> Can anyone help?
>

Hi!

Here's one way.....

Assume you have in A1:A9

1
2
3
4
5
7
8
9
10

6 is the missing value.

Array entered using the key combo of CTRL,SHIFT,ENTER:

=INDEX(ROW(INDIRECT(A1&":"&A9)),MATCH(0,COUNTIF(A1:A9,ROW(INDIRECT(A1&":"&A9))),0))

Biff

"Nash" <[email protected]> wrote in message
news:[email protected]...
> Looking for a function or formula that will identify a missing number in a
> range of cells containing a sequence of numbers.
>
> Can anyone help?
>