it's base 2 but it's like base 2.5 so 1 = 1 2 = 2 3 = 3 4 = 20 8 = 40 12 = 220 16 = 400 20 = 420 24 = 440 28 = 2300 32 = 2320 36 = 2340 40 = 4200
