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).
Sort a list of complex numbers based on far they are from the origin.
Roll the Dice!
Specific Element Count
Height of a right-angled triangle
Two functions (to be sure)
Longest Collatz Sequence
Find the path through the cell
How to reverse spdiags?
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