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.
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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 if input is odd
Project Euler: Problem 5, Smallest multiple
What's Your BMI?
Find the dimensions of a matrix
Create a vector
Expression or variable?
Return a list sorted by number of consecutive occurrences
Mirror, mirror on the wall, who is fairest of them all?
I want to know everything!
Recycled Numbers (CodeJam Qualification Round 2012)
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