a(n)=least k such that base 6 representation of n begins at s(k), where s=A030548.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =8a(7) =1a(8) =12a(9) =14a(10) =16a(11) =18a(12) =11a(13) =22a(14) =2a(15) =26a(16) =28a(17) =30a(18) =13a(19) =25a(20) =36a(21) =3a(22) =40a(23) =42a(24) =15a(25) =27a(26) =39a(27) =50a(28) =4a(29) =54