All cubes are in the form 7n
+ 1. That is, when 1 is added or subtracted from the cube, they will be
multiples of 7.
2x2x2 = 8 = (7x1) + 1
3x3x3 = 27=(7x4) - 1
4x4x4 = 64=(7x9) + 1
5x5x5 = 125=(7x18) + 1
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