Semiprimes in A056105.

Terms

a(0) =9a(1) =22a(2) =134a(3) =177a(4) =226a(5) =482a(6) =737a(7) =1046a(8) =1282a(9) =1681a(10) =1977a(11) =2641a(12) =3202a(13) =3401a(14) =3817a(15) =4034a(16) =4486a(17) =5462a(18) =5721a(19) =6817a(20) =7401a(21) =7702a(22) =8966a(23) =9634a(24) =9977a(25) =10681a(26) =11042a(27) =11409a(28) =12937a(29) =15409