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).
Angle between two vectors
Determine Whether an array is empty
~~~~~~~ WAVE ~~~~~~~~~
Divisible by 4
Rotate Matrix @180 degree
Add more zeros
Chess ELO rating system
Without the French accent please!
Two functions (to be sure)
Pandigital number n°2 (Inspired by Project Euler 32)
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