Cubes are numbers to the power of 3. For example...

1 = 13
8 = 23
27 = 33
64 = 43
125 = 53

And you can write 23 as the sum of 9 cubes:

23 = 23 + 23 + 13 + 13 + 13 + 13 + 13 + 13 + 13

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