Products p*q*r*s of distinct primes for which (p*q*r*s + 1)/2 is prime.

Terms

a(0) =1365a(1) =3045a(2) =4305a(3) =4485a(4) =4785a(5) =4845a(6) =5005a(7) =5313a(8) =6045a(9) =6405a(10) =7161a(11) =7665a(12) =8265a(13) =8745a(14) =9165a(15) =9345a(16) =9933a(17) =10005a(18) =10101a(19) =10465a(20) =10545a(21) =10605a(22) =10965a(23) =11305a(24) =11685a(25) =12441a(26) =12597a(27) =13585a(28) =14385a(29) =14421