Numbers k such that (865*10^k - 1)/9 is prime.

Terms

a(0) =7a(1) =13a(2) =25a(3) =40a(4) =58a(5) =133a(6) =229a(7) =232a(8) =310a(9) =358a(10) =778a(11) =977a(12) =1057a(13) =1271a(14) =4417a(15) =4757a(16) =5242a(17) =6413a(18) =11539a(19) =60583a(20) =149737