Every run of digits of n in base 9 has length 2.

Terms

a(0) =10a(1) =20a(2) =30a(3) =40a(4) =50a(5) =60a(6) =70a(7) =80a(8) =810a(9) =830a(10) =840a(11) =850a(12) =860a(13) =870a(14) =880a(15) =890a(16) =1620a(17) =1630a(18) =1650a(19) =1660a(20) =1670a(21) =1680a(22) =1690a(23) =1700a(24) =2430a(25) =2440a(26) =2450a(27) =2470a(28) =2480a(29) =2490