Numbers having three 1's in base 9.

Terms

a(0) =91a(1) =739a(2) =811a(3) =819a(4) =821a(5) =822a(6) =823a(7) =824a(8) =825a(9) =826a(10) =827a(11) =829a(12) =838a(13) =847a(14) =856a(15) =865a(16) =874a(17) =883a(18) =901a(19) =982a(20) =1063a(21) =1144a(22) =1225a(23) =1306a(24) =1387a(25) =1549a(26) =2278a(27) =3007a(28) =3736a(29) =4465