Indices of (probable) primes in A030221.

Terms

a(0) =2a(1) =3a(2) =5a(3) =6a(4) =8a(5) =9a(6) =15a(7) =18a(8) =23a(9) =53a(10) =114a(11) =194a(12) =564a(13) =575a(14) =585a(15) =2594a(16) =3143a(17) =4578a(18) =4970a(19) =9261a(20) =11508a(21) =13298a(22) =30018a(23) =54993a(24) =198476