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.
Which values occur exactly three times?
Calculate the area of a triangle between three points
The number of trailing zero digit of a factorial
Number of even divisors of a given number
Fractal: area and perimeter of Koch snowflake
Make a rainbow matrix (follow-up to checkerboard matrix)
The last non-zero digit of a factorial
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