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

N

Nash

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?
 
P

Peo Sjoblom

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)
 
B

Biff

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
 
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