Immune Numbers and Their Properties

In Numberland, a detective investigates the mysterious disappearance of natural numbers. The city is in chaos as numbers are drained of their essence, with slime-lines indicating prime numbers. The detective identifies immune numbers, which are prime and cannot be split into non-prime parts. These immune numbers are key to solving the mystery. The detective rescues the immune numbers and confronts the vampire responsible, restoring peace to Numberland.

What is the main issue facing Numberland in the introduction?

• A technological malfunction

• A political crisis

• A mysterious draining of natural numbers

• A series of natural disasters

What distinguishes the slime-lined numbers from others?

• They are prime numbers

• They are composite numbers

• They are all even numbers

• They are all odd numbers

Which of the following is NOT a one-digit immune number?

• 5

• 4

• 3

• 2

Why can't a number ending in 2 or 5 be immune?

• They are always even

• They are always odd

• They are always prime

• They are always divisible by 2 and 5

What is the significance of the number 373 in the mystery?

• It is a non-prime number

• It is the vampire's number

• It is the first victim

• It is the last immune number

Which two-digit number is immune?

• 23

• 57

• 27

• 35

What is the main reason a four-digit number cannot be immune?

• It would be too large

• No three-digit immune number starts with a 7

• It would be a composite number

• It would be divisible by 4

What is the primary method used to identify immune numbers?

• Checking if they are prime and cannot be split into non-prime numbers

• Checking if they can be split into non-prime numbers

• Checking if they are divisible by 10

• Checking if they are even

What is the role of the immune numbers according to the prophecy?

• They are to be sacrificed

• They are to be hidden

• They are vampire slayers

• They are meant to be leaders

What happens to the vampire at the end of the story?

• It is sent away after being disempowered

• It is destroyed

• It is captured and imprisoned

• It escapes and continues its attacks