A good opportunity to implement a hashtable: lots of collisions without it.
A re-post of Solution 1137054, because that one doesn't appear in the list of solutions, for some reason (I'm not sure why).
Remove the vowels
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Integer Sequence - II : New Fibonacci
Write c^3 as sum of two squares a^2+b^2
I want to know everything!
Can you beat the lottery again (for hardcore coder) ?
BLOCK x3 (Version 4)
Decrypt the cypher using XOR encryption (for beginners)
Generalised Hamming Number
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