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
Circular Primes (based on Project Euler, problem 35)
Numbers spiral diagonals (Part 2)
Make roundn function
Extra safe primes
Find my secret number
Generalised Hamming Number
Numbers spiral diagonals (Part 1)
Find indices of diagonal elements
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