Every suffix prime and no 0 digits in base 7 (written in base 7).

Terms

a(0) =2a(1) =3a(2) =5a(3) =23a(4) =25a(5) =32a(6) =43a(7) =52a(8) =65a(9) =443a(10) =452a(11) =623a(12) =625a(13) =632a(14) =652a(15) =2452a(16) =2623a(17) =6625a(18) =6652a(19) =42623a(20) =642623a(21) =6642623