%I
%S 1,2,3,4,5,6,7,8,14,16,19,22,24,27,29,32,38,54,57,60,76,94,132,139,
%T 175,187,208,230,379,384,632,1040,1188,1359,1553,1734,1768,1925,2492,
%U 3272,3537,3949,4647,5869,6473,7036,8550,9459,9784,15440,15507,15637,16400,42045
%N Numbers k such that 3*2^k + 5 is prime.
%t Do[ If[ PrimeQ[ 3*2^n + 5 ], Print[ n ] ], {n, 1, 3000} ]
%o (PARI) {for(n=0, 10^6, if(isprime(k=5+3*2^n), print1(n, ", ")))} /* _Joerg Arndt_, Apr 13 2012 */
%Y Cf. A057912 (3*2^k + 5 is prime).
%K nonn
%O 1,2
%A _Robert G. Wilson v_, Nov 16 2000
%E a(54) from _Jinyuan Wang_, Feb 02 2020
