Each term is a palindrome such that the sum of its proper divisors is a palindrome > 1.

Terms

a(0) =4a(1) =6a(2) =8a(3) =9a(4) =333a(5) =646a(6) =656a(7) =979a(8) =1001a(9) =3553a(10) =10801a(11) =11111a(12) =18581a(13) =31713a(14) =34943a(15) =48484a(16) =57375a(17) =95259a(18) =99099a(19) =158851a(20) =262262a(21) =569965a(22) =1173711a(23) =1216121a(24) =1399931a(25) =1439341a(26) =1502051a(27) =1925291a(28) =3203023a(29) =3436343