[seqfan] Christmas puzzle: What is the next number in the sequence 2, 3, ...?

mathstutoring mathstutoring at ntlworld.com
Fri Dec 25 11:10:33 CET 2009

Consider the sequence of integers p for which p is prime and 2p-1 and 2p+1 are a pair of twin primes.

Does anyone know what the next term is (if it exists it is greater than 2.5 x 10^9), or have a proof that the above sequence is complete?

One to ponder after the Christmas turkey


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