Palindromic prime numbers == 1 (mod 9).

Terms

a(0) =181a(1) =757a(2) =919a(3) =12421a(4) =16561a(5) =18181a(6) =19891a(7) =30403a(8) =34543a(9) =35353a(10) =70507a(11) =71317a(12) =77977a(13) =78787a(14) =95959a(15) =96769a(16) =97579a(17) =98389a(18) =1008001a(19) =1065601a(20) =1114111a(21) =1163611a(22) =1196911a(23) =1212121a(24) =1245421a(25) =1253521a(26) =1278721a(27) =1286821a(28) =1327231a(29) =1335331