When n is a natural number, must the value of n ^ 2 + 9N + 1 be prime

It's a prime number, n ^ 2 + 9N + 1. You can't divide it into two numbers to multiply, so it must be a prime number,
You can calculate upstairs, 2 ^ 2 + 9N + 1 = 33? It's 23, big brother!

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