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A036950
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Smallest n-digit prime containing only digits 7 and 9, or 0 if no such prime exists.
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0
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7, 79, 797, 0, 77797, 777977, 7777997, 77779799, 777777799, 7777779799, 77777779979, 777777779777, 7777777779977, 77777777777977, 777777777779797, 7777777777797799, 77777777777777797, 777777777777797977
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