Numbers k such that 2^k + 11 is prime.

Terms

a(0) =1a(1) =3a(2) =5a(3) =7a(4) =9a(5) =15a(6) =23a(7) =29a(8) =31a(9) =55a(10) =71a(11) =77a(12) =297a(13) =573a(14) =1301a(15) =1555a(16) =1661a(17) =4937a(18) =5579a(19) =6191a(20) =6847a(21) =6959a(22) =19985a(23) =26285a(24) =47093a(25) =74167a(26) =149039a(27) =175137a(28) =210545a(29) =240295