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Start of the first set of 4 prime-index primes in arithmetic progression, i.e., (353 = prime(prime(20)), 431 = prime(prime(23)), 509 = prime(prime(25)), 587 = prime(prime(28)). [Jacobs]

 

  Submitted: 2012-07-01 12:04:19;   Last Modified: 2016-08-05 07:01:44.



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