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Old 2016-04-16, 22:55   #10
rogue's Avatar
Apr 2003
Between here and the

3×31×71 Posts

Make sure you sieve deeply enough. For base 2, I'm continuing to sieve up to 1e13 and it is still removing factors at more than one an hour. Granted higher bases won't need to be sieved as deeply to find prime with the same number of bits for lower bases, but I wouldn't be surprised if most bases need to be sieved to at least 1e12.
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