1. Species of Function: ............Exotic


       2. Equation: .......................f(n)=[n/5]+[n/25]+[n/125]+[n/625]+...
 
 
       3. Nickname: ..Zeros  
 
       4. Why is this a favorite?

This function gives the number of 0s at the end of n!.
What's cooler than that?  Plus, it comes in handy for math
contests.
 
       5. Name: ...................Geoff Tims