%I #8 Jan 08 2018 18:35:37
%S 0,54,86486,669666,66690666,88884088884,666667866666,66666672666666,
%T 88888860088888860,6666666660666666666,666666666006666666660,
%U 88888888884688888888884,6666666660000666666666000,666666666000006666666660000,88888888888882288888888888882
%N a(n) is the largest number such that all of a(n)'s length-n substrings are distinct and divisible by 54.
%H Hans Havermann, <a href="/A093211/a093211.txt">Table of A093211-A093299</a>
%e a(3) is 86486 because its length-3 substrings (864, 648, 486) are all distinct and divisible by 54 and there is no larger number with this property.
%Y Cf. A093211, A093212, ..., A093299.
%K base,nonn
%O 1,2
%A _Hans Havermann_, Mar 29 2004
%E a(11)-a(15) from _John Cerkan_, Jan 08 2018