In fact, I just used it to solve a number 3 orders of magnitude larger than 600851475143, the number from prob 3. It took 12s. I hardly dare go further than that... I'm not arguing that there's a big list being built in there...
Oops, I dared. 5 orders of magnitude bigger crashes my machine. Oops oops, it finished. It says it took 161 seconds, but in fact it sort of half-crashed my machine for the last 30 minutes... -- Keith
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