[1] What are the smallest 5 possible values of b?

[2] What is the largest value b cannot assume?

Now let us generalize the second part.

[3] Find the largest value of b where a/b cannot equal b when it is multiplied by 10^n and rounded to the nearest whole number. (Part [2] is n=2)

Solve for n = 1, 2, 3, 4, ...