a(n)=least k such that base 9 representation of n begins at s(k), where s=A031087.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =26a(9) =10a(10) =1a(11) =14a(12) =16a(13) =18a(14) =20a(15) =22a(16) =24a(17) =44a(18) =13a(19) =30a(20) =2a(21) =34a(22) =36a(23) =38a(24) =40a(25) =42a(26) =62a(27) =15a(28) =33a(29) =50