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A104669
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Smallest semiprime containing exactly n 2's.
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0
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21, 22, 2122, 20222, 202222, 1222222, 22220222, 122222222, 2222222221, 22222222226, 202222222222, 2222212222222, 22222222222223, 212222222222222, 2222222222212222, 22222222202222222, 202222222222222222
(list; graph; refs; listen; history; internal format)
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