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Starting at 328628315459 there are 13 consecutive primes p for which p+2 is a semiprime. This is the longest known sequence (as of 2009) of consecutive primes which are Chen primes without being twin primes. [Andersen]


  Submitted: 2009-09-11 06:46:43;   Last Modified: 2014-08-30 10:16:45.

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