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).
Return elements unique to either input
Whether the input is vector?
Find the maximum number of decimal places in a set of numbers
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Rounding off numbers to n decimals
BLOCK x3 (Version 3)
Find indices of diagonal elements
Decrypt the cypher using XOR encryption (for beginners)
Find files with extension ext in the current directory
Numbers spiral diagonals (Part 2)
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