length!! and not "not isempty"... good point!
Find common elements in matrix rows
Circular Primes (based on Project Euler, problem 35)
Find the nearest integer
There are 10 types of people in the world
Mirror, mirror on the wall, who is fairest of them all?
Recycled Numbers (CodeJam Qualification Round 2012)
Can you beat the lottery again (for hardcore coder) ?
Longest Collatz Sequence
Return a list sorted by number of consecutive occurrences
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