Numbers k such that 39*10^k + 1 is prime.

Terms

a(0) =4a(1) =6a(2) =12a(3) =14a(4) =18a(5) =26a(6) =40a(7) =46a(8) =114a(9) =138a(10) =194a(11) =484a(12) =889a(13) =939a(14) =1264a(15) =1808a(16) =1964a(17) =2077a(18) =5929a(19) =6512a(20) =8892a(21) =10862a(22) =38120a(23) =53664a(24) =88822