%I
%S 0,72484,97204804,99720048004,99972000480004,99997200004800004,
%T 99999720000048000004,99999972000000480000004,
%U 99999997200000004800000004,99999999720000000048000000004
%N a(n) is the largest number such that all of a(n)'s lengthn substrings are distinct and divisible by 12.
%C Observation: at least for the first nine positive terms a(n) is also the concatenation of n2 9´s, 72, n2 0's, 48, n2 0's, and 4.  _Omar E. Pol_, May 21 2017
%H Hans Havermann, <a href="/A093211/a093211.txt">Table of A093211A093299</a>
%e a(2) is 72484 because its length2 substrings (72, 24, 48, 84) are all distinct and divisible by 12 and there is no larger number with this property
%Y Cf. A093211, A093213, ..., A093299.
%K base,nonn,more
%O 1,2
%A _Hans Havermann_, Mar 28 2004
%E a(8)a(10) from _John Cerkan_, May 21 2017
