I like the way James present a problem: educatiive and interesting.
Check if sorted
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Return area of square
Polite numbers. N-th polite number.
Longest run of consecutive numbers
Circular Primes (based on Project Euler, problem 35)
A (wrong) place for everything, and everything in its (wrong) place
Singularity v5 (with apologies to the true hack masters)
Rewrite setdiff to account for non-unique values
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