Left truncatable primes in base 7 (written in decimal form).

Terms

a(0) =2a(1) =3a(2) =5a(3) =17a(4) =19a(5) =23a(6) =31a(7) =37a(8) =47a(9) =227a(10) =233a(11) =311a(12) =313a(13) =317a(14) =331a(15) =919a(16) =997a(17) =2371a(18) =2389a(19) =10601a(20) =111443a(21) =817337