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.
Sums with Excluded Digits
Back to basics 3 - Temp Directory
Doubling elements in a vector
0, 2, 0, -2, 0, 2, 0, -2, ...
The number of trailing zero digit of a factorial
Smallest n, for n! to have m trailing zero digits
Make a rainbow matrix (follow-up to checkerboard matrix)
Number of even divisors of a given number
Under the sea: Snell's law & total internal reflection
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