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 state names that end with the letter A
2 b | ~ 2 b
What is the scope of variables in Matlab ?
Magic is simple (for beginners)
Recycled Numbers (CodeJam Qualification Round 2012)
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