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).
Find the palindrome
Reindex a vector
Doubling elements in a vector
Reverse the elements of an array
Binary code (array)
Narcissistic number ?
Recycled Numbers (CodeJam Qualification Round 2012)
Permute diagonal and antidiagonal
How to reverse spdiags ?
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