Another example, 229 - 1, is even harder to work out. I can tell you that its smallest
prime factor is more than 100.

When you are ready to check, just scroll down the screen all the way to the bottom.



 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

229 - 1 = 536870911 = 233 x 1103 x 2089