Remove the vowels
Number of 1s in the Binary Representation of a Number
Sum all integers from 1 to 2^n
Determine the number of odd integers in a vector
Number of even divisors of a given number
Under the sea: Snell's law & total internal reflection
The last non-zero digit of a factorial
The number of trailing zero digit of a factorial
Make a rainbow matrix (follow-up to checkerboard matrix)
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