a(n) is the greatest k >= 0 such that n*k has distinct decimal digits.

Terms

a(0) =9876543210a(1) =4938271605a(2) =3292181070a(3) =2469135780a(4) =1975308642a(5) =1646090535a(6) =1410934743a(7) =1234567890a(8) =1097393690a(9) =987654321a(10) =897865830a(11) =823045260a(12) =759734010a(13) =705467358a(14) =658436214a(15) =617283945a(16) =580973130a(17) =548696845a(18) =519818058a(19) =493827156a(20) =470311581a(21) =448932915a(22) =429414840