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%I #5 Mar 30 2012 18:39:52
%S 0,8421,75672,760273087,7677679779737737,99997899997,
%T 777300377790097776006777,7777778477777721777777,
%U 77777752577777725277777752,7777770021777777008477777700
%N a(n) is the largest number such that all of a(n)'s length-n substrings are distinct and divisible by 21.
%H Hans Havermann, <a href="/A093211/a093211.txt">Table of A093211-A093299</a>
%e a(2) is 8421 because its length-2 substrings (84, 42, 21) are all distinct and divisible by 21 and there is no larger number with this property
%Y Cf. A093211, A093212, ..., A093299.
%K base,nonn
%O 1,2
%A _Hans Havermann_, Mar 28 2004
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