Numbers k such that (115*10^k - 7)/9 is prime.

Terms

a(0) =1a(1) =2a(2) =14a(3) =26a(4) =53a(5) =86a(6) =133a(7) =206a(8) =245a(9) =323a(10) =362a(11) =872a(12) =4562a(13) =12577a(14) =14294a(15) =18425a(16) =21713a(17) =27728a(18) =87368a(19) =106772