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).
Summing Digits within Text
Counting in Finnish
Magic is simple (for beginners)
Do you like your boss?
Find vampire numbers
Find files with extension ext in the current directory
Longest Collatz Sequence
Pandigital number n°1 (Inspired by Project Euler 32)
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