Every prefix prime in base 7 (written in base 7).

Terms

a(0) =2a(1) =3a(2) =5a(3) =23a(4) =25a(5) =32a(6) =52a(7) =56a(8) =254a(9) =256a(10) =322a(11) =326a(12) =524a(13) =566a(14) =2564a(15) =3262a(16) =5246a(17) =5662a(18) =25642