Bases in which 7 is a unique-period prime.

Terms

a(0) =2a(1) =3a(2) =4a(3) =5a(4) =6a(5) =8a(6) =13a(7) =18a(8) =19a(9) =27a(10) =48a(11) =50a(12) =55a(13) =97a(14) =111a(15) =195a(16) =223a(17) =342a(18) =344a(19) =391a(20) =447a(21) =685a(22) =783a(23) =895a(24) =1371a(25) =1567a(26) =1791a(27) =2400a(28) =2402a(29) =2743