Primes remaining prime if any digit is deleted (zeros allowed).

Terms

a(0) =23a(1) =37a(2) =53a(3) =73a(4) =113a(5) =131a(6) =137a(7) =173a(8) =179a(9) =197a(10) =311a(11) =317a(12) =431a(13) =617a(14) =719a(15) =1013a(16) =1031a(17) =1097a(18) =1499a(19) =1997a(20) =2239a(21) =2293a(22) =3137a(23) =4019a(24) =4919a(25) =6173a(26) =7019a(27) =7433a(28) =9677a(29) =10193