a(1) = 9, a(n+1) = smallest multiple of a(n) using only composite digits (4,6,8,9,0) and is not divisible by 10.

A078238

a(1) = 9, a(n+1) = smallest multiple of a(n) using only composite digits (4,6,8,9,0) and is not divisible by 10.

Terms

    a(0) =9a(1) =99a(2) =9009a(3) =99099a(4) =44990946a(5) =494900406

External references