The description of the problem is slightly misleading. It says the sum "below" 10, yet the sum includes 10. It should be ammended to "Find the sum of all the non-primes below the input, and including the input, N.", or something to that effect.
I've now fixed the problem statement to be consistent.
Determine if input is odd
Angle between two vectors
Generate a NaN...on purpose
Do Fast Fourier Transformation
Create an index-powered vector
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