Successorship is adding one to any number.
As an example, n+1.
Adding one is just moving one place to the right on a number line.
n+1 is always equal to n+((1/n)*n)
1.) (S)3 = 3+1 = 4
2.) (S)4 = 4+1 = 5
Using repeated successorship will grant you the opportunity to use addition, or just repeated successorship.