Numbers k such that (38*10^k + 691)/9 is prime.

Terms

a(0) =2a(1) =4a(2) =8a(3) =10a(4) =14a(5) =16a(6) =29a(7) =106a(8) =179a(9) =197a(10) =365a(11) =371a(12) =557a(13) =857a(14) =862a(15) =1163a(16) =1454a(17) =2206a(18) =5075a(19) =22384a(20) =149999a(21) =196792