Thanks. Both responses are helpful. The link to the Gauss writeup was
exactly what I was looking for.

::S::n=::1/2n(a1::+an)

So, if I have consequtive integers from A1 to An, I don't need to key a
column of numbers to add up. Instead, just list the first and last
number, then use this formula.

If A1 = 1, B1 = 5

C1 = A2*(A1+A2)/2

then

C1 = 15

Thanks again for the help.


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Leebo
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