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 all the words that end with "ain"
Sorted highest to lowest?
Right and wrong
System of equations
Remove the Zero
Add more zeros
Mysterious digits operation (easy)
Pandigital number n°1 (Inspired by Project Euler 32)
Rank of magic square (for beginners)
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