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).
Max index of 3D array
Sum the numbers on the main diagonal
The sum of the numbers in the vector
Find the nearest prime number
Return a list sorted by number of consecutive occurrences
Rank of magic square (for beginners)
Find the path through the cell
Two functions (to be sure)
Narcissistic number ?
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