Indices of primes in A049685.

Terms

a(0) =2a(1) =3a(2) =6a(3) =9a(4) =15a(5) =21a(6) =44a(7) =50a(8) =114a(9) =146a(10) =228a(11) =270a(12) =326a(13) =329a(14) =776a(15) =1001a(16) =1353a(17) =1374a(18) =3579a(19) =5144a(20) =13133a(21) =29790a(22) =31710a(23) =40455