a(n)=least k such that base 10 representation of n begins at s(k), where s=A031310.

Terms

a(0) =8a(1) =7a(2) =6a(3) =5a(4) =4a(5) =3a(6) =2a(7) =1a(8) =11a(9) =8a(10) =166a(11) =147a(12) =127a(13) =107a(14) =87a(15) =67a(16) =47a(17) =27a(18) =150a(19) =148a(20) =7a(21) =144a(22) =125a(23) =105a(24) =85a(25) =65a(26) =45a(27) =25a(28) =130a(29) =128