a(n) = prime(Fibonacci(phi(n))), where prime = A000040, Fibonacci = A000045 and phi = A000010.

Terms

a(0) =2a(1) =2a(2) =2a(3) =2a(4) =5a(5) =2a(6) =19a(7) =5a(8) =19a(9) =5a(10) =257a(11) =5a(12) =827a(13) =19a(14) =73a(15) =73a(16) =7793a(17) =19a(18) =23159a(19) =73a(20) =827a(21) =257a(22) =196687a(23) =73a(24) =67931a(25) =827a(26) =23159a(27) =827a(28) =4528949a(29) =73