First occurrence of just n semiprimes occurs between the a(n)-th prime and the next prime.

Terms

a(0) =1a(1) =2a(2) =4a(3) =11a(4) =24a(5) =34a(6) =30a(7) =47a(8) =221a(9) =259a(10) =189a(11) =375a(12) =429a(13) =217a(14) =1831a(15) =1879a(16) =1229a(17) =3795a(18) =3644a(19) =4522a(20) =2225a(21) =10229a(22) =14862a(23) =4612a(24) =34202a(25) =38590a(26) =66762a(27) =14357a(28) =44227a(29) =40933