Semiprimes sandwiched between semiprimes.

Terms

a(0) =34a(1) =86a(2) =94a(3) =122a(4) =142a(5) =202a(6) =214a(7) =218a(8) =302a(9) =394a(10) =446a(11) =634a(12) =698a(13) =842a(14) =922a(15) =1042a(16) =1138a(17) =1262a(18) =1346a(19) =1402a(20) =1642a(21) =1762a(22) =1838a(23) =1894a(24) =1942a(25) =1982a(26) =2102a(27) =2182a(28) =2218a(29) =2306