I use a Voyage 200 now. If I need to find the sum from 1 to 11 of x^3, I enter:

sigma(x^3, x, 1, 11)

to get 4356. I think the TI-83 works the same.

For my problem, the summation formula is:

(n^2(n+1)^2)/4 with n=11

__________________
Chris
Independent Baptist
Michigan
Layman