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).
Which doors are open?
Project Euler: Problem 2, Sum of even Fibonacci
Change the sign of even index entries of the reversed vector
Equal to their cube
Convert radians to degrees
Numbers spiral diagonals (Part 2)
What is the scope of variables in Matlab ?
Mirror, mirror on the wall, who is fairest of them all?
Negation and new variables
BLOCK x3 (Version 1)
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