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).
Determine Whether an array is empty
Circular Primes (based on Project Euler, problem 35)
03 - Matrix Variables 3
Concatenate two strings
Sum of series V
Find Missing Number
Decrypt the cypher using XOR encryption (for beginners)
Permute diagonal and antidiagonal
Add more zeros
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