Square-chain primes (including square-loop primes).

Terms

a(0) =2a(1) =13a(2) =31a(3) =79a(4) =97a(5) =101a(6) =109a(7) =131a(8) =181a(9) =227a(10) =313a(11) =401a(12) =409a(13) =631a(14) =727a(15) =797a(16) =881a(17) =1009a(18) =1013a(19) =1097a(20) =2797a(21) =3109a(22) =3181a(23) =3631a(24) =4001a(25) =4013a(26) =7901a(27) =8101a(28) =9001a(29) =9013