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 the vowels
Project Euler: Problem 7, Nth prime
Create a vector whose elements depend on the previous element
Unique values without using UNIQUE function
Find nth maximum
Can you beat the lottery again (for hardcore coder) ?
Decrypt the cypher using XOR encryption (for beginners)
Recycled Numbers (CodeJam Qualification Round 2012)
Pandigital number n°2 (Inspired by Project Euler 32)
Mirror, mirror on the wall, who is fairest of them all?
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