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> What is the smallest number for which it's unknown whether it's prime
> or composite?
>
>
In my (naive and not very documented) opinion, it should not be so much
more that the highest prime known (which seems to be 2^(43.112.609) -1,
if I believe Wolfram) : add 2, or 4, etc. and check if you can obtain
some trivial factor (like divisibility by 3) - if not then it's probably
unknown.
At second though, maybe your point is precisely that this smallest
number with unknown status can be much *smaller* than the highest prime
known ?
tuabiht
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