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A106662
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Smallest semiprime ending in exactly n 7's.
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0
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57, 77, 3777, 17777, 277777, 1777777, 17777777, 877777777, 3777777777, 17777777777, 577777777777, 1777777777777, 37777777777777, 877777777777777, 4777777777777777, 37777777777777777, 277777777777777777
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