Semiprimes in A103375.

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) =129a(12) =265a(13) =2049a(14) =3865a(15) =4163a(16) =8557a(17) =14005a(18) =80413a(19) =104757a(20) =116333a(21) =152713a(22) =241354a(23) =2273893a(24) =2492909a(25) =16432401a(26) =31701485a(27) =34090613a(28) =263504954a(29) =424792297