Every prefix and suffix prime in base 8 (written in base 8).

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =23a(5) =27a(6) =35a(7) =37a(8) =53a(9) =57a(10) =73a(11) =75a(12) =213a(13) =235a(14) =357a(15) =373a(16) =513a(17) =535a(18) =573a(19) =737a(20) =753a(21) =3513