I am a prime number less than 10 if you add 10 or 20 the result is a prime number what number am i?

The Prime number less than 10 that, when added to either 10 or 20, results in a prime number is 3. When you add 10 to 3, you get 13, which is a prime number. Similarly, when you add 20 to 3, you get 23, which is also a prime number.