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A114909
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a(n) is the largest base-7 string such that the n-th number coprime to 7 does not divide any substring of a(n).
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1
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5, 55, 656, 6662, 55555, 6565321, 66566566, 666566633, 6666612543, 65656565656, 666666666513, 66656665654315, 656565653543211, 6666666666666212, 66566566566566566, 665665665623461651
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