Numbers k such that 7*10^k - 47 is prime.

Terms

a(0) =1a(1) =2a(2) =5a(3) =8a(4) =11a(5) =14a(6) =15a(7) =30a(8) =31a(9) =42a(10) =69a(11) =85a(12) =120a(13) =128a(14) =449a(15) =685a(16) =686a(17) =741a(18) =1291a(19) =1521a(20) =2165a(21) =9110a(22) =9150a(23) =11366a(24) =13154a(25) =33321a(26) =40758a(27) =50789a(28) =51440a(29) =65492