Semiprimes with digits in strictly decreasing order.

Terms

a(0) =4a(1) =6a(2) =9a(3) =10a(4) =21a(5) =51a(6) =62a(7) =65a(8) =74a(9) =82a(10) =85a(11) =86a(12) =87a(13) =91a(14) =93a(15) =94a(16) =95a(17) =321a(18) =542a(19) =543a(20) =721a(21) =731a(22) =753a(23) =763a(24) =831a(25) =841a(26) =842a(27) =843a(28) =851a(29) =862