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).
Find the two most distant points
Check if sorted
Given a matrix, swap the 2nd & 3rd columns
Find indices of diagonal elements
Generalised Hamming Number
Replicate elements in vectors
How to reverse spdiags?
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