Programming Exercise (HP-15C, 15C LE - and others)

[Steve Simpkin]

(03-29-2014 12:36 AM)Tugdual Wrote:  Nobody mentioned that entering $$\sum _{ K=1 }^{ 10000 }{ \frac { { (-1 })^{ K+1 } }{ K } }$$ on the Prime with no need for any sort of coding would instantly return 0.693097183025
Is that off scope consideration for this thread?
I know that the prime is blazing fast but the speed is so impressive that I wonder if the calculator is actually performing a loop?

For reference:
The TI-36X Pro arrived at the answer of 0.693097183 in 5:45 minutes.
The Casio fx-115ES Plus took just over 11 minutes to arrived at the answer of 0.6930971831.
It's a good thing these models are solar powered
Not bad for $20 machines.