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A048547
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a(n)*(a(n)+1) is smallest pronic number containing exactly n 9's.
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1
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9, 31, 890, 2234, 14131, 30331, 173031, 969520, 9958890, 31617890, 360542549, 547631234, 3316547890, 17318486343, 114017542334, 356363452109
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