Chapter 5, Lesson 5
Bea told Agnes two facts she has learned about numbers:
The proper factors of a positive integer are all of its factors except for the integer itself.
Two numbers are called friendly if each number is the sum of the proper factors of the other.
Bea and Agnes tried to find some friendly numbers. They think that 220 and 284 are a pair of friendly numbers. Do you agree or disagree? Explain.