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A093221
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a(n) is the largest number such that all of a(n)'s length-n substrings are distinct and divisible by 21.
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0
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0, 8421, 75672, 760273087, 7677679779737737, 99997899997, 777300377790097776006777, 7777778477777721777777, 77777752577777725277777752, 7777770021777777008477777700
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