Numbers k such that 213*2^k+1 is prime.

Terms

a(0) =2a(1) =6a(2) =14a(3) =17a(4) =36a(5) =62a(6) =80a(7) =84a(8) =156a(9) =726a(10) =866a(11) =2234a(12) =4274a(13) =5972a(14) =17054a(15) =17462a(16) =21630a(17) =145146a(18) =217950a(19) =391026a(20) =546146a(21) =573332a(22) =906152a(23) =978900a(24) =1728569a(25) =2226329a(26) =3807864a(27) =3990702a(28) =4625484a(29) =4865126