Primes with repdigit indices (in decimal).

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =11a(5) =13a(6) =17a(7) =19a(8) =23a(9) =31a(10) =79a(11) =137a(12) =193a(13) =257a(14) =317a(15) =389a(16) =457a(17) =523a(18) =607a(19) =1399a(20) =2239a(21) =3119a(22) =4019a(23) =4973a(24) =5903a(25) =6907a(26) =7907a(27) =8933a(28) =19583a(29) =30911