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.
Stuff the Board
Create an 'arrow-head" matrix
Find the logic
Solving Quadratic Equations (Version 2)
Fractal: area and perimeter of Koch snowflake
Under the sea: Snell's law & total internal reflection
The number of trailing zero digit of a factorial
Smallest n, for n! to have m trailing zero digits
The last non-zero digit of a factorial
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