a(n) is the largest base-9 string such that the n-th number coprime to 9 does not divide any substring of a(n).

A114911

a(n) is the largest base-9 string such that the n-th number coprime to 9 does not divide any substring of a(n).

Terms

    a(0) =7a(1) =777a(2) =8787a(3) =886845a(4) =7777777a(5) =878754321a(6) =8888787871a(7) =887885887811

External references