Starting from 440Hz note (musical note A above middle C), create 13 notes, using twelve-tone equal temperament, in Herz units. https://en.wikipedia.org/wiki/Equal_temperament
Your output will be like [440, ... , 880] all rounded to integer.
Return a list sorted by number of occurrences
vectorization in N
Find the relation
Divisible by 5
Fractal: area and perimeter of Koch snowflake
Number of paths on a n-dimensional grid
Make a rainbow matrix (follow-up to checkerboard matrix)
Smallest n, for n! to have m trailing zero digits
Number of even divisors of a given number
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