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?

24    24r+!                 (2+sqrt(4))!
36    3!6*                  3! * 6

71    7!1+r                 sqrt(7! + 1)

144   14r+!4!*             (1+sqr(4))! * 4!
145   14!+5!+              1+4!+5!

355   35!*5-               3*5!-5

456   45!6-*               4*(5!-6)

733   73!!+3!+             7+3!!+3!
736   736^+                7+3^6

1285  128^+5*             (1+2^8)*5   

1573  15!+73!+*           (1+5!)*(7+3!)