Seven-digit primes whose first, third, fifth, and seventh digits are the same.

Terms

a(0) =1010131a(1) =1011191a(2) =1012171a(3) =1014121a(4) =1014131a(5) =1014161a(6) =1015171a(7) =1016111a(8) =1017131a(9) =1110181a(10) =1111151a(11) =1111181a(12) =1112131a(13) =1112141a(14) =1112171a(15) =1113181a(16) =1114111a(17) =1115131a(18) =1117111a(19) =1118101a(20) =1119121a(21) =1210151a(22) =1211141a(23) =1211191a(24) =1212121a(25) =1212191a(26) =1213141a(27) =1213151