Semiprimes in A103376.

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) =511a(14) =2038a(15) =2059a(16) =4097a(17) =4174a(18) =7894a(19) =16021a(20) =19857a(21) =31313a(22) =32419a(23) =33238a(24) =37711a(25) =116197a(26) =196609a(27) =220937a(28) =262978a(29) =273926