A is prime, a + 40 and a + 80 are prime. What is a?

A is prime, a + 40 and a + 80 are prime. What is a?

According to the fact that a is prime, a + 40 and a + 80 are also prime, a = 3 can be satisfied. And because the remainder of a, a + 40 and a + 80 divided by 3 is definitely different, there must be one divisible by 3, and they are all prime, so it can only be a = 3

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