R-ary: R is actually an integer, and commonly used ones are r=2 (binary), r=8 (octal) and r= 16 (hexadecimal). R has a wider range and can be any positive integer, that is to say, only 0~r- 1 appears in the binary number.

R-ary means every r 1, which means it is enough to move forward by one bit. For example, we often use decimal system, that is, every 10 decimal 1.