Let a = {- 1, 1, 3}, B = {a + 2, A2 + 2}, a ∩ B = {3}, then the value of real number a is______ ．

∩ set a = {- 1, 1, 3}, B = {a + 2, A2 + 2}, a ∩ B = {3}, when a + 2 = 3, a = 1, B = {3, 3}, does not hold; when A2 + 2 = 3, a = ± 1, when a = 1, does not hold; when a = - 1, B = {1, 3}, a ∩ B = {1, 3}, does not hold

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