Indices of the primes that occur in A104589.

Terms

a(0) =1a(1) =3a(2) =6a(3) =25a(4) =104a(5) =634a(6) =1236a(7) =22613a(8) =103409a(9) =929044a(10) =6298419a(11) =80396036a(12) =843325558a(13) =5843115733a(14) =24428345613a(15) =515211289906