Numbers k such that (28*10^k - 13) / 3 is prime.

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =5a(5) =8a(6) =10a(7) =14a(8) =17a(9) =20a(10) =33a(11) =64a(12) =80a(13) =152a(14) =158a(15) =166a(16) =194a(17) =196a(18) =198a(19) =901a(20) =971a(21) =1289a(22) =1595a(23) =2921a(24) =14390a(25) =28781a(26) =35840