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 a column by a row
Angle between Two Vectors
Sophie Germain prime
Oh Zero Zero Zero!!!
Side of a rhombus
Pandigital number n°1 (Inspired by Project Euler 32)
Two functions (to be sure)
Find my secret number
Pandigital number n°3 (Inspired by Project Euler 32)
Find indices of diagonal elements
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