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Disruption of consecutive numbers

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# 1  
Old 04-16-2013
Disruption of consecutive numbers
I do have a tab delimited file with the following format

Code:
200 46
201 67
204 89
205 98
206 89
208 890
210 23
..
...

100's of rows

I would like to output the missing consecutive number of the first column.

The expected output will be:
Code:
202
203
207
209

It would be great if I could specify the start and end numbers. Let me know the best way to do this using awk or sed.
# 2  
Old 04-16-2013
Code:
awk 'NR==1{n=$1;next}{while($1-n++>1)print n}' file

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