a(n)=least k such that base 8 representation of n begins at s(k), where s=A031035.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =10a(9) =1a(10) =14a(11) =16a(12) =18a(13) =20a(14) =22a(15) =24a(16) =13a(17) =28a(18) =2a(19) =32a(20) =34a(21) =36a(22) =38a(23) =40a(24) =15a(25) =31a(26) =46a(27) =3a(28) =50a(29) =52