Question 768355
<pre>
1, 4, 27, ??, 3125?
Ans:
1 = 1
4 = 2*2
27 = 3*3*3
???
3125 = 5*5*5*5*5

Get the pattern? 
The missing number is obviously 4^4 or 4*4*4*4 = 256

:)