Numbers > 9 with all digits the same.

Terms

a(0) =11a(1) =22a(2) =33a(3) =44a(4) =55a(5) =66a(6) =77a(7) =88a(8) =99a(9) =111a(10) =222a(11) =333a(12) =444a(13) =555a(14) =666a(15) =777a(16) =888a(17) =999a(18) =1111a(19) =2222a(20) =3333a(21) =4444a(22) =5555a(23) =6666a(24) =7777a(25) =8888a(26) =9999a(27) =11111a(28) =22222a(29) =33333