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).
Prime factor digits
Back to basics 11 - Max Integer
01 - Scalar variables
Height of a right-angled triangle
Can you beat the lottery again (for hardcore coder) ?
Expression or variable?
Find my secret number
Numbers spiral diagonals (Part 2)
Return a list sorted by number of consecutive occurrences
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