Numbers k such that 89*10^k - 7 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =19a(4) =33a(5) =42a(6) =73a(7) =259a(8) =271a(9) =297a(10) =303a(11) =324a(12) =392a(13) =623a(14) =1218a(15) =2801a(16) =4273a(17) =6071a(18) =6383a(19) =8699a(20) =8706a(21) =15139a(22) =17163a(23) =40491a(24) =54518a(25) =83976a(26) =89687a(27) =105284a(28) =168614