Numbers k such that 23*2^k+1 is prime.

Terms

a(0) =1a(1) =9a(2) =13a(3) =29a(4) =41a(5) =49a(6) =69a(7) =73a(8) =341a(9) =381a(10) =389a(11) =649a(12) =1961a(13) =3929a(14) =977541a(15) =1399841a(16) =1448461a(17) =2425641a(18) =4300741