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A048537
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a(n)*(a(n)+1) is smallest pronic number containing exactly n 4's.
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2
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6, 66, 215, 681, 6681, 12018, 201115, 1531159, 6541784, 21058215, 156340764, 675098840, 5868938806, 6666461193, 120186956049, 586862372693
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