Numbers k such that 7*10^k + 27 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =34a(6) =38a(7) =49a(8) =51a(9) =89a(10) =91a(11) =132a(12) =227a(13) =3662a(14) =5019a(15) =9729a(16) =25437a(17) =99944a(18) =106553a(19) =114577