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.
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).
Check if sorted
Is this triangle right-angled?
Find the next Fibonacci number
BLOCK x3 (Version 4)
How to reverse spdiags ?
Find indices of diagonal elements
Generalised Hamming Number
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