Pretty Numbers
  • A number is called a pretty number if it has exactly 3 different whole number factors. For example, the factors of 4 are 1, 2, and 4 since 1 x 4 =4 and 2 x 2 = 4. The factor 2 is not counted twice. What is the sum of all the pretty numbers between 0 and 50?

Answer:    
  Please enter a numerical answer
(ex. 1000 or 2.033) and click GO.		    

Contest problems and answers provided by:

David Rock
rock_david@colstate.edu
Columbus State University

Doug Brumbaugh
brumbad@pegasus.cc.ucf.edu
University of Central Florida