%I
%S 2,3,5,37,41,139,317,541,2521
%N Primes p such that either 3^p2 or 3^p+2 is prime.
%C At p = 2, 3, 139, 3^p + 2 is prime, while at p = 2, 5, 37, 41, 317, 541, 2521 3^p  2 is prime.
%C a(10) > 2*10^5.  _Robert Price_, Nov 20 2013
%e 2 is in the sequence because both 3^2  2 = 7 and 3^2 + 2 = 11 are primes.
%e 3 is in the sequence because 3^3 + 2 = 29 is a prime (though 3^3  2 = 25 = 5^2).
%e 5 is in the sequence because 3^5  2 = 241 is a prime (though 3^5 + 2 = 245 = 5 * 7^2.
%t Select[Prime[Range[100]], PrimeQ[3^#  2]  PrimeQ[3^# + 2] &] (* _Alonso del Arte_, Nov 20 2013 *)
%Y Cf. A014224, A051783.
%K nonn
%O 1,1
%A Herman H. Rosenfeld (herm3(AT)pacbell.net), Dec 20 2003
%E Edited by _Zak Seidov_, Aug 08 2006
