Russell McMahon wrote:
> The information on which numbers within a set of 30 numbers are prime 
> can be stored in a single 8 bit byte (!)
> Obvious enough on consideration. (Only the same 8 numbers within any 
> given 30 sequentially numbered group are potentially prime).

Actually, those are only POSSIBLY prime.  As the range of numbers gets 
larger (for N*30 where N is, say, 100,000,000) there will be even less, 
so you still have to test to see if it is really prime.

--Michael
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