|
%I #4 Sep 08 2022 08:45:51
%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
|
