Palindromic and divisible by 7.

Terms

a(0) =0a(1) =7a(2) =77a(3) =161a(4) =252a(5) =343a(6) =434a(7) =525a(8) =595a(9) =616a(10) =686a(11) =707a(12) =777a(13) =868a(14) =959a(15) =1001a(16) =1771a(17) =2002a(18) =2772a(19) =3003a(20) =3773a(21) =4004a(22) =4774a(23) =5005a(24) =5775a(25) =6006a(26) =6776a(27) =7007a(28) =7777a(29) =8008