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).
Multiply 2 numbers
We love vectorized solutions. Problem 1 : remove the row average.
Matrix multiplication across rows
Binary code (array)
Convert radians to degrees
Mysterious digits operation (easy)
Negation and new variables
Rank of magic square (for beginners)
Divisors for big integer
I want to know everything!
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