Find the missing number?

by

11
13
9
15

The missing number is 13.

The numbers in the sequence are all prime numbers, except for 10, which is a composite number. The sequence

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starts with 2, which is the smallest prime number, and then increases by 2 each time. Therefore, the missing number must be the next prime number after 11, which is 13.

A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. A composite number is a natural number greater than 1 that is not prime.

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