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A083192
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a(1) = 1, then the rearrangement of composite numbers such that the concatenation of n terms from the n-th term is a prime. (Concatenation of n-th term to (2n-1)th term is a prime number).
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1
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1, 4, 21, 6, 49, 8, 77, 9, 39, 10, 81, 12, 221, 14, 63, 15, 203, 16, 143, 18, 511, 20, 217, 22, 279, 24, 299, 25, 319, 26, 33, 27, 147, 28, 943, 30, 121, 32, 87, 34, 333, 35, 781, 36, 249, 38, 679, 40, 99, 42, 117, 44, 1463, 45, 697, 46, 187, 48, 207, 50, 219, 51, 639, 52
(list; graph; refs; listen; history; internal format)
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