Palindromic in base 6.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =7a(7) =14a(8) =21a(9) =28a(10) =35a(11) =37a(12) =43a(13) =49a(14) =55a(15) =61a(16) =67a(17) =74a(18) =80a(19) =86a(20) =92a(21) =98a(22) =104a(23) =111a(24) =117a(25) =123a(26) =129a(27) =135a(28) =141a(29) =148