It means the number to the power of 3.
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If you mean the sum of two cubed numbers then the answer is simply 'none' with the trivial exception of all of them being 0. For more info check out "Fermat's last theorem".
1 cubed = 13 = 1x1x1 = 1 2 cubed = 23 = 2x2x2 = 8 3 cubed = 33 = 3x3x3 = 27 4 cubed = 43 = 4x4x4 = 64 5 cubed = 53 = 5x5x5 = 125
It means that whatever number comes before the "4 Cubed", then you multiply that number four times by itself. Ex. 4^4=4x4x4x4=256
15 cubed = 3,375
squared is 49. Cubed is 343.