Be careful, I've implemented the sieve, but not all versions of it are sufficiently fast to handle the biggest numbers in the test suite.
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This doesn't use primes(x),but still feels a little like cheating.
The whole point of using the sieve is not knowing which numbers are prime. So it is no different than sum(primes).
Remove the air bubbles
Back to basics 6 - Column Vector
Mysterious digits operation (easy)
I want to know everything!
BLOCK x3 (Version 4)
Replicate elements in vectors
Two functions (to be sure)
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