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).
The Goldbach Conjecture, Part 2
First N Perfect Squares
Convert from Base 10 to base 5
Find the path through the cell
Pandigital number n°3 (Inspired by Project Euler 32)
Find my secret number
Permute diagonal and antidiagonal
Narcissistic number ?
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