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.
Increment a number, given its digits
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Maximum value in a matrix
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Under the sea: Snell's law & total internal reflection
Number of even divisors of a given number
Number of paths on a 3d grid
Smallest n, for n! to have m trailing zero digits
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