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.
Find the sum of the elements in the "second" diagonal
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Given area find sides
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Number of even divisors of a given number
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The number of trailing zero digit of a factorial
Number of paths on a 3d grid
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