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A036949
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Smallest n-digit prime containing only digits 7 and 8, or 0 if no such prime exists.
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0
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7, 0, 787, 7877, 78787, 777787, 7778777, 77778887, 777788887, 7777778887, 77777778887, 777777777877, 7777777787777, 77777777778787, 777777777777787, 7777777778788777, 77777777777778887, 777777777787878887
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