Palindromic primes with middle digit 1.

Terms

a(0) =313a(1) =919a(2) =18181a(3) =30103a(4) =35153a(5) =38183a(6) =93139a(7) =1201021a(8) =1221221a(9) =1281821a(10) =1311131a(11) =1371731a(12) =1411141a(13) =1461641a(14) =1551551a(15) =1611161a(16) =1761671a(17) =1831381a(18) =1851581a(19) =1881881a(20) =1941491a(21) =1951591a(22) =1981891a(23) =3001003a(24) =3091903a(25) =3181813a(26) =3211123a(27) =3241423