Numbers k such that 2^k + 3 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =6a(5) =7a(6) =12a(7) =15a(8) =16a(9) =18a(10) =28a(11) =30a(12) =55a(13) =67a(14) =84a(15) =228a(16) =390a(17) =784a(18) =1110a(19) =1704a(20) =2008a(21) =2139a(22) =2191a(23) =2367a(24) =2370a(25) =4002a(26) =4060a(27) =4062a(28) =4552a(29) =5547