logo Practice-It logo

BJP4 Exercise 4.21: perfectNumbers

Language/Type: Java if/else for loops method basics mod
Author: Roy McElmurry (on 2016/09/08)

A "perfect number" is a positive integer that is the sum of all its proper factors (that is, factors including 1 but not the number itself). The first two perfect numbers are 6 and 28, since 1+2+3=6 and 1+2+4+7+14=28. Write a static method perfectNumbers that takes an integer max as an argument and prints out all perfect numbers that are less than or equal to max.

Here is the console output from a call to perfectNumbers(6):

Perfect numbers up to 6: 6 

Here is the console output from a call to perfectNumbers(500):

Perfect numbers up to 500: 6 28 496 
Type your solution here:

This is a method problem. Write a Java method as described. Do not write a complete program or class; just the method(s) above.

You must log in before you can solve this problem.

Log In

If you do not understand how to solve a problem or why your solution doesn't work, please contact your TA or instructor.
If something seems wrong with the site (errors, slow performance, incorrect problems/tests, etc.), please

Is there a problem? Contact a site administrator.