10
11
12
13
Answer is Wrong!
Answer is Right!
The missing character is 12.
The first three numbers are all prime numbers, and the fourth number is 10, which is not a prime number. Therefore, the missing number must be a prime number that is greater than 10. The only prime number that is greater than 10 and less than 13 is 12.
A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number.