1111 1 * 23 + 1 * 22 + 1 * 21 + 1 * 20 = 8 + 4 + 2 + 1 = 15
1010 1 * 23 + 0 * 22 + 1 * 21 + 0 * 20 = 8 + 0 + 2 + 0 = 10
1010101010 1 * 27 + 0 * 26 + 1 * 25 + 0 * 24 + 1 * 23 + 0 * 22 + 1 * 21 + 0 * 20
= 128 + 0 + 32 + 0 + 8 + 0 + 2 + 0
= 170