Palindromic primes in base 3 (written in base 3).

Terms

a(0) =2a(1) =111a(2) =212a(3) =12121a(4) =20102a(5) =22122a(6) =1001001a(7) =1021201a(8) =1111111a(9) =1201021a(10) =1221221a(11) =2001002a(12) =2021202a(13) =2101012a(14) =2111112a(15) =2121212a(16) =2201022a(17) =2211122a(18) =102111201a(19) =110111011