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Old 2016-05-06, 08:13   #3
mickfrancis
 
Apr 2014
Marlow, UK

23·7 Posts
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Quote:
Originally Posted by jasonp View Post
Once the problem size gets above a fairly small threshold, the runtime needed for sieving small primes becomes insignificant compared to sieving everything else; there are only a few such, and they cache nicely, so they're done in a flash compared to the thousands of larger primes you must also sieve with.
Makes sense - thanks Jason.
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