Color alternate excel rows based on duplicate numbering system.

Hello Experts.

I have a Excel 2003 spreadsheet.  In Column A I have the numbering system below which will go beyond 150 by the end of the year.  I would like to use something like conditional formatting so each new number sequence is an alternate color (grey/white) across to Column AO. (Color in bracket for emphasis only)

1_2013 (white)
2_2013 (Grey)
2_2013 (Grey)
2_2013 (Grey)
2_2013 (Grey)
3_2013 (White)
4_2013 (Grey)
5_2013 (White)
6_2013 (Grey)
7_2013 (White)
7_2013 (White)
8_2013 (Grey)

etc, etc, etc

As soon as the number is entered, it colors that row to the alternate color to Column AO

Thank you in advance.

Who is Participating?
BenefordConnect With a Mentor Commented:
Is it easy to extract a sequential number from column AO?
eg left(AO1,find("_",AO1)-1)

If so, you can use an even/odd formula in your conditional formatting.

I don't have Excel 2003, but in 2010, I can use the following formulae and have the two formulae covering the same range giving alternate colours as you specified.


If it's not easy to get a sequential number, then you could introduce a hidden column that checks AO34 against AO33 as follows:


And then use column BO to determine the colour you want.
mattm2002Author Commented:
Thanks Beneford

I added your sequential suggestion to AP (given AO has data in it)

I did some more research based on your suggestion and found the following worked for 2003, coloring based on an even or odd number.


Worked like a charm, much appreciated.

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