Numbers whose base-10 expansion has no run of digits with length < 2.

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) =1100a(19) =1111a(20) =1122a(21) =1133a(22) =1144a(23) =1155a(24) =1166a(25) =1177a(26) =1188a(27) =1199a(28) =2200a(29) =2211