a(n)=least k such that base 9 representation of n begins at s(k), where s=A031100.

Terms

a(0) =1a(1) =8a(2) =2a(3) =10a(4) =3a(5) =12a(6) =4a(7) =14a(8) =5a(9) =92a(10) =7a(11) =1a(12) =9a(13) =99a(14) =11a(15) =102a(16) =13a(17) =105a(18) =8a(19) =108a(20) =17a(21) =111a(22) =19a(23) =114a(24) =21a(25) =117a(26) =23a(27) =97a(28) =18a(29) =123