Semiprimes that are product of a Fermat prime and a Mersenne prime.

Terms

a(0) =9a(1) =15a(2) =21a(3) =35a(4) =51a(5) =93a(6) =119a(7) =155a(8) =381a(9) =527a(10) =635a(11) =771a(12) =1799a(13) =2159a(14) =7967a(15) =24573a(16) =32639a(17) =40955a(18) =139247a(19) =196611a(20) =393213a(21) =458759a(22) =655355a(23) =1572861a(24) =2031647a(25) =2105087a(26) =2228207a(27) =2621435a(28) =8323199a(29) =8912879