**343**or

**2592.**

343=(3+4)^3

2592=2^5*9^2.

343=(3+4)^3

2592=2^5*9^2.

We have just shown that some numbers stay unchanged when a number of mathematical operators are added /inserted, without changing the order of the digits.

Within our puzzle lets call those numbers expressionist numbers.

Let us limit the set of acceptable mathematical symbols to the following operators: **
+, -, *, /, ^, sqrt, !. ** and any amount of brackets.

My questions:

In the
period between** 10 A.D. & 2016 A.D.** what years were labeled by expressionist numbers?

How many such years will there be between **2017 A.D. & 9999 A.D.**?

Bonus: How about one, two (or more) 5-digit examples?