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 sum of the elements in the "second" diagonal
Find a subset that divides the vector into equal halves
Longest Collatz Sequence
How many monitors are connected ?
Find files with extension ext in the current directory
BLOCK x3 (Version 4)
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