Numbers k such that (7*10^k + 71)/3 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =7a(6) =23a(7) =29a(8) =37a(9) =39a(10) =40a(11) =89a(12) =115a(13) =189a(14) =227a(15) =253a(16) =301a(17) =449a(18) =533a(19) =607a(20) =969a(21) =1036a(22) =1207a(23) =1407a(24) =1701a(25) =3493a(26) =7147a(27) =11342a(28) =21638a(29) =22327