All of the code for primes() I've seen on this thread are 2-10x slower than any of the four shown on RosettaCode for this task.

If you want the fastest speed, use the ntheory module -- is_prime for primality testing, primes or forprimes or one of the related functions for generating primes. This will be a few orders of magnitude faster.

In reply to Re^5: Number functions.. primes (ugly code runs faster) by danaj
in thread Number functions I have lying around by Lady_Aleena

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