Numbers k such that (17*10^k - 89)/9 is prime.

Terms

a(0) =2a(1) =3a(2) =6a(3) =12a(4) =39a(5) =45a(6) =50a(7) =75a(8) =126a(9) =282a(10) =431a(11) =459a(12) =1557a(13) =2724a(14) =3453a(15) =4058a(16) =15879a(17) =24209a(18) =31844a(19) =61760a(20) =155133