Numbers n such that 6*n^2 + 6*n + 1 is prime. 1, 2, 3, 5, 7, 8, 9, 10, 12, 13, 18, 19, 20, 22, 23, 30, 31, 32, 33, 35, 36, 38, 41, 42, 43
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