487 = 4100 + 810 + 71 = 410^2 + 810^1 + 710^0
10101 = 12^4 + 02^3 + 12^2 + 02^1 + 12^0 = 116 + 08 + 14 + 02 + 11 = 21
21 = 21/2 => 10_1 -> 10/2 => 5_0 -> 5/2 => 2_1 -> 2/2 => 1_0 -> 1 = 10101
