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979956113 is the only nine-digit left-truncatable prime which differs from the next left-truncatable prime by only a digit. I.e., replacing 5 with 8 produces 979986113, which is the next left-truncatable prime. [Opao]


  Submitted: 2003-11-18 20:36:10;   Last Modified: 2008-01-30 11:28:00.

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