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A175171 Primes p such that 3*2^p-1 is also prime 0

%I

%S 2,3,7,11,43,103,827,7559,26459,164987

%N Primes p such that 3*2^p-1 is also prime

%C These are the primes in A002235. [From _R. J. Mathar_, May 02 2010]

%e For p=2, 3*2^2-1=11; p=3, 3*2^3-1=23; p=7, 3*2^7-1=383

%o (MAGMA) [p: p in PrimesUpTo(7000) | IsPrime(3*2^p-1) ]

%K nonn

%O 1,1

%A _Vincenzo Librandi_, Mar 09 2010

%E 3 more terms from _R. J. Mathar_, May 02 2010

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Last modified January 23 19:16 EST 2022. Contains 350515 sequences. (Running on oeis4.)