Semiprimes s such that phi(s)/2 is prime.

Terms

a(0) =9a(1) =10a(2) =14a(3) =22a(4) =46a(5) =94a(6) =118a(7) =166a(8) =214a(9) =334a(10) =358a(11) =454a(12) =526a(13) =694a(14) =718a(15) =766a(16) =934a(17) =958a(18) =1006a(19) =1126a(20) =1174a(21) =1438a(22) =1678a(23) =1726a(24) =1774a(25) =1966a(26) =2038a(27) =2374a(28) =2566a(29) =2614