Summation based benchmark for calculators

[ijabbott]

HP-27S
n=1000
t∼120s
Result=1395.3462877

Code:

BENCH=Σ(X:1:1000:1:EXP(SIN(ATAN(X)))^.333333333333)

Surprisingly fast compared to HP-42S.

(I originally used 'INV(3)' instead of '.333333333333', but it was slower due to the extra function overhead. The calculator has no cube root or nth root function.)