Numbers of the form (10^c-1)*the product any two (not necessarily distinct) terms of A074992.

Terms

a(0) =9a(1) =99a(2) =333a(3) =999a(4) =3663a(5) =9999a(6) =12321a(7) =30303a(8) =36963a(9) =99999a(10) =135531a(11) =333333a(12) =369963a(13) =999999a(14) =1121211a(15) =1367631a(16) =3003003a(17) =3363633a(18) =3699963a(19) =9999999a(20) =12333321a(21) =13688631a(22) =33033033a(23) =33666633a(24) =36999963a(25) =99999999a(26) =102030201a(27) =111111111a(28) =124454421a(29) =136898631