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A048538
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Smallest pronic number containing exactly n 4's.
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1
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42, 4422, 46440, 464442, 44642442, 144444342, 40447444340, 2344449414440, 42794944444440, 443448440044440, 24442434644444460, 455758444444444440
(list; graph; refs; listen; history; internal format)
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