Digital Root/Examples/10010111101 Base 2

Examples of Digital Roots
In binary notation, we have:
 * $\map {s_2} {10010111101_2} = 1 + 0 + 0 + 1 + 0 + 1 + 1 + 1 + 1 + 0 + 1 = 7 = 111_2$


 * $\map {s_2} {111_2} = 1 + 1 + 1 = 3 = 11_2$


 * $\map {s_2} {11_2} = 1 + 1 = 2 = 10_2$


 * $\map {s_2} {10_2} = 1 + 0 = 1 = 1_2$

It is pretty obvious that the digital root of any non-zero number in base $2$ is always $1$.