a(n) = smallest number m such that n appears in decimal expansion of 1/m.

Terms

a(0) =6a(1) =4a(2) =3a(3) =7a(4) =2a(5) =6a(6) =7a(7) =7a(8) =11a(9) =10a(10) =9a(11) =8a(12) =23a(13) =7a(14) =19a(15) =6a(16) =17a(17) =49a(18) =21a(19) =5a(20) =19a(21) =31a(22) =13a(23) =29a(24) =4a(25) =19a(26) =29a(27) =7a(28) =17a(29) =13