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88888 is the only five-digit repunit such that the product of itself and all truncations of itself plus and minus one results in twin primes. I.e., 88888*8888*888*88*8 ± 1 are twin primes. [Opao]

 

  Submitted: 2003-12-15 00:01:04;   Last Modified: 2008-01-30 11:28:00.



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