Semiprimes in A103373.

Terms

a(0) =4a(1) =9a(2) =15a(3) =21a(4) =33a(5) =38a(6) =58a(7) =65a(8) =86a(9) =106a(10) =121a(11) =249a(12) =895a(13) =989a(14) =1199a(15) =2059a(16) =3073a(17) =9206a(18) =12302a(19) =19766a(20) =33238a(21) =63109a(22) =197459a(23) =252982a(24) =283942a(25) =477931a(26) =691357a(27) =4598261a(28) =8671301a(29) =9819097