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Re:Can My Water Cooled Raspberry Pi Cluster Beat My MacBook? by totalZero on Friday March 26, 2021 @09:51AM (#26592122)
Whether or not that is true, the code snippet in the article shows this comment:

   #0 and 1 are not primes
Re:Can My Water Cooled Raspberry Pi Cluster Beat My MacBook? by dan1234 on Friday March 26, 2021 @10:54AM (#26592886)
That's in the multiprocessing version, which was written by someone else and returns 1229 primes.

The original code includes 1 as a prime.