Summation based benchmark for calculators

[Marc van Lemmen]

I've got it running on my HP9100B, but with another formula since there is no power function. Math is not my strong point, but i've used exp(ln(exp(sin(atan)))/3) which is al fraction faster than the original formula.
On my HP9821A it gave the following results : 10 ~4 sec. / 100 ~37 sec. / 1000 ~375 sec.


Result for the HP9100B :

10 ~6.5 sec. result 13.71183502
100 ~66 sec. result 139.2971870

Since my Hp9100B stops working after a few minutes I was not able to run it with 1000.