Chapter 5, Lesson 4 In their study of number theory, Bea and Jay
have learned that: The proper factors of a positive integer are
all of its factors except for the integer itself. If the sum of
the proper factors: = the number, then the number is perfect. >
the number, then the number is abundant. < the number, then the
number is deficient. Today, Bea and Jay learned that if a number
is abundant and you can find a set of fewer than all of its
proper factors that add up to the number, then the number is
called semiperfect. Bea said that 12 is an example of a
semiperfect number. Do you agree or disagree? Explain. Now you
find a number less than or equal to 30 that is semiperfect.