Semiprimes s such that (3s+1)/2 is semiprime and A001414(s)=2*A001414((3s+1)/2).

Terms

a(0) =114239a(1) =144059a(2) =933899a(3) =1918199a(4) =25054499a(5) =30495419a(6) =33065159a(7) =72602039a(8) =255442559a(9) =353104079a(10) =575473559a(11) =808589879a(12) =846509819a(13) =1042804799a(14) =1055710979a(15) =1059728279a(16) =1184657879a(17) =1247085239a(18) =1791627599a(19) =2196997739a(20) =2323221179a(21) =2372469179a(22) =2591327159a(23) =3063507719a(24) =3276652079a(25) =4021840859a(26) =5489857619a(27) =5716553879a(28) =6022735799