a(n) = A000040(A072578(n)).

Terms

a(0) =19a(1) =53a(2) =139a(3) =193a(4) =311a(5) =313a(6) =409a(7) =577a(8) =641a(9) =719a(10) =787a(11) =809a(12) =1033a(13) =1061a(14) =1097a(15) =1171a(16) =1193a(17) =1289a(18) =1627a(19) =1637a(20) =1657a(21) =1669a(22) =1693a(23) =1699a(24) =1747a(25) =1811a(26) =1877a(27) =1889a(28) =2083a(29) =2089