Prime-indexed primes: primes with prime subscripts.

Terms

a(0) =3a(1) =5a(2) =11a(3) =17a(4) =31a(5) =41a(6) =59a(7) =67a(8) =83a(9) =109a(10) =127a(11) =157a(12) =179a(13) =191a(14) =211a(15) =241a(16) =277a(17) =283a(18) =331a(19) =353a(20) =367a(21) =401a(22) =431a(23) =461a(24) =509a(25) =547a(26) =563a(27) =587a(28) =599a(29) =617