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A036938
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Smallest n-digit prime containing only digits 2 and 7, or 0 if no such prime exists.
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0
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2, 0, 227, 2777, 22277, 272227, 2227727, 22227277, 222222227, 2222222777, 22222222277, 222222272777, 2222222227727, 22222222777277, 222222222222227, 2222222222227727, 22222222222227227, 222222222227227727
(list; graph; refs; listen; history; internal format)
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