Numbers n such that 7^n - 12 is prime.

Terms

a(0) =2a(1) =3a(2) =4a(3) =12a(4) =27a(5) =28a(6) =34a(7) =36a(8) =147a(9) =179a(10) =242a(11) =276a(12) =278a(13) =466a(14) =735a(15) =2371a(16) =4548a(17) =5606a(18) =10324a(19) =82899