%I
%S 2,3,7,11,43,103,827,7559,26459,164987
%N Primes p such that 3*2^p1 is also prime
%C These are the primes in A002235. [From _R. J. Mathar_, May 02 2010]
%e For p=2, 3*2^21=11; p=3, 3*2^31=23; p=7, 3*2^71=383
%o (MAGMA) [p: p in PrimesUpTo(7000)  IsPrime(3*2^p1) ]
%K nonn
%O 1,1
%A _Vincenzo Librandi_, Mar 09 2010
%E 3 more terms from _R. J. Mathar_, May 02 2010
