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A083197
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Triangular array, read by rows, where if n is odd the n-th row consists of n least unused nonprimes, while if n is even the n-th row consists of the n least unused primes.
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0
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1, 2, 3, 4, 6, 8, 5, 7, 11, 13, 9, 10, 12, 14, 15, 17, 19, 23, 29, 31, 37, 16, 18, 20, 21, 22, 24, 25, 41, 43, 47, 53, 59, 61, 67, 71, 26, 27, 28, 30, 32, 33, 34, 35, 36, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 127, 131, 137
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