Indices of prime numbers in A014259.

Terms

a(0) =3a(1) =4a(2) =5a(3) =7a(4) =21a(5) =35a(6) =97a(7) =830a(8) =947a(9) =2627a(10) =15031a(11) =20365a(12) =25823a(13) =79169