Previous palindromic prime concatenated with this palindromic prime is prime.

Terms

a(0) =3a(1) =32323a(2) =33533a(3) =37573a(4) =38083a(5) =79397a(6) =1123211a(7) =1126211a(8) =1163611a(9) =1180811a(10) =1268621a(11) =1276721a(12) =1317131a(13) =1338331a(14) =1447441a(15) =1550551a(16) =1565651a(17) =1609061a(18) =1764671a(19) =1829281a(20) =1895981a(21) =3236323a(22) =3563653a(23) =3627263a(24) =7065607a(25) =7087807