A is a prime less than 10, a + 40 is a prime, a + 80 is a prime, and a is a prime______ ．

According to the meaning of prime numbers, prime numbers less than 10 are 2, 3, 5 and 7. If 40 + 3 = 43 and 80 + 3 = 83 are prime numbers, then a is 3

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