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).
Is A the inverse of B?
Compute a dot product of two vectors x and y
Spot the outlier
Implement a bubble sort technique and output the number of swaps required
There are 10 types of people in the world
Mysterious digits operation (easy)
Replicate elements in vectors
Permute diagonal and antidiagonal
Longest Collatz Sequence
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