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.
Back to basics 4 - Search Path
Given a 4x4 matrix, swap the two middle columns
Natural numbers in string form
0, 2, 0, -2, 0, 2, 0, -2, ...
The number of trailing zero digit of a factorial
Number of paths on a n-dimensional grid
Fractal: area and perimeter of Koch snowflake
Number of even divisors of a given number
Under the sea: Snell's law & total internal reflection
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