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The first occurrence of two successive twin prime pairs {(107, 109) ; (137, 139)} whose smaller and larger members concatenate respectively into a prime (107137) and an emirp (109139). Note that the reverse concatenation of the larger members also forms an emirp (139109). [Beedassy]


  Submitted: 2009-12-10 20:00:57;   Last Modified: 2009-12-11 07:16:10.

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