Yes - primegen is very impressive .... and so is your technique for storing and retrieving them :-)

But how does that relate to the statement I was addressing - namely "Considering that lists of prime numbers are easily available, I'm not so sure whether a sieve beats reading them from disk" ? To me, it's fairly apparent that Anonymous Monk was thinking of getting a list of prime numbers, putting them in a flat text file, and reading that file into memory whenever the list of primes is needed. I was simply clarifying for him that the sieve is faster.

I guess it's possible that I'm selling Anonymous Monk short .... perhaps the storage/retrieval technique that he envisaged was more sophisticated and efficient than I gave him credit for - something like yours, for example. (If so ... my apologies to Anonymous Monk.)

Cheers,
Rob

In reply to Re^7: Math help: Finding Prime Numbers by syphilis
in thread Math help: Finding Prime Numbers by Ovid

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