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A104690
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Smallest semiprime containing exactly n 4's.
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0
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4, 445, 4414, 44441, 444441, 4444441, 44444441, 444444449, 4444444441, 44444444443, 444444444447, 4444444444443, 44444444444441, 444444444444445, 4444444444444447, 44444444444444447, 444444444444444442
(list; graph; refs; listen; history; internal format)
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