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 2019-04-08, 12:54 #1 enzocreti   Mar 2018 17·31 Posts a 27 digit twin prime pair I found this pair of 27 digit twin primes: 1- 149907114776274341482621993 2- 149907114776274341482621991 I would know if it is possible with Pari or Pfgw to find the next and the previous pair of twin primes?
 2019-04-08, 13:47 #2 LaurV Romulan Interpreter     Jun 2011 Thailand 19·467 Posts Yes, it is possible, and it takes less than a second to run. Code: gp > n=149907114776274341482621993; while((m=nextprime(n+1))-n>2, n=m); n %1 = 149907114776274341482622207 The other direction exercise for you.
 2019-04-08, 15:25 #3 enzocreti   Mar 2018 52710 Posts 149907114776274341482621993 149907114776274341482621993 is the concatenation in base ten of the prime factors of 25!-1

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