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A106656
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Smallest semiprime ending in exactly n 1's.
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0
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21, 411, 111, 1111, 11111, 2111111, 1111111, 211111111, 2111111111, 21111111111, 11111111111, 4111111111111, 121111111111111, 511111111111111, 2111111111111111, 81111111111111111, 11111111111111111
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