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Total time: 7 seconds, 903 milliseconds, 752 microseconds, and 944 nanoseconds</pre>

 

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Using bit indexing is very useful here as with byte indexing, the sieve needs 10GB. On a computer with only 8 GB , as this is the case of the laptop I use to run these programs, it fails to execute (I have a very small swap and don’t want to use the swap anyway). With bit indexing, the sieve needs only 1,25GB which is more reasonable.