a(n) is the least semiprime > a(n-1) whose digits do not appear in a(n-1).

Terms

a(0) =4a(1) =6a(2) =9a(3) =10a(4) =22a(5) =33a(6) =46a(7) =51a(8) =62a(9) =74a(10) =82a(11) =91a(12) =202a(13) =314a(14) =502a(15) =611a(16) =703a(17) =815a(18) =922a(19) =1003a(20) =2227a(21) =3005a(22) =4117a(23) =5006a(24) =7111a(25) =8002a(26) =9111a(27) =20003a(28) =41119a(29) =50003