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A093263
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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 63.
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0
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0, 63, 7567, 774977, 77742777, 99993699993, 777779177777, 77777784777777, 7777777147777777, 7777777770777777777, 777777777007777777770
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