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).
Back to basics 21 - Matrix replicating
Is A the inverse of B?
CONVERT TAN TO SIN
Numbers spiral diagonals (Part 2)
Permute diagonal and antidiagonal
Add more zeros
BLOCK x3 (Version 3)
Magic is simple (for beginners)
Expression or variable?
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