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The smallest prime formed by concatenating the smaller members of two successive twin prime pairs: {(11, 13) ; (17, 19)}. Note that the reverse concatenation of the larger members forms an emirp (1913), and that similar properties hold for the two successive twin prime pairs {(101, 103) ; (107, 109)} : 101107 is prime while 109103 is an emirp. [Beedassy]

Submitted: 2009-11-29 17:04:40; Last Modified: 2009-11-29 18:22:03.