Numbers k such that (167*10^k - 17)/3 is prime.

Terms

a(0) =3a(1) =5a(2) =13a(3) =15a(4) =21a(5) =39a(6) =45a(7) =75a(8) =171a(9) =229a(10) =293a(11) =321a(12) =355a(13) =359a(14) =1411a(15) =2245a(16) =3121a(17) =8466a(18) =9368a(19) =40111a(20) =102315a(21) =126637a(22) =173571