Composite numbers whose multiplicative digital root is 9.

Terms

a(0) =9a(1) =33a(2) =91a(3) =119a(4) =133a(5) =1119a(6) =1133a(7) =1191a(8) =1313a(9) =1331a(10) =1911a(11) =3113a(12) =3131a(13) =3311a(14) =9111a(15) =11133a(16) =11191a(17) =11313a(18) =11331a(19) =11911a(20) =13113a(21) =13131a(22) =13311a(23) =19111a(24) =31113a(25) =31131a(26) =31311a(27) =33111a(28) =91111a(29) =111133