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A068998
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Numbers n such that the concatenation of the prime factors of n (in increasing order) is prime.
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0
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2, 3, 5, 6, 7, 8, 9, 11, 12, 13, 16, 17, 18, 19, 21, 22, 23, 24, 25, 27, 29, 31, 32, 33, 36, 37, 39, 41, 43, 44, 46, 47, 48, 49, 51, 53, 54
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