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A048374
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a(n)^3 is smallest cube containing exactly n 9's.
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1
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9, 31, 99, 998, 999, 7937, 9999, 99998, 99999, 996999, 999999, 6688699, 9999999, 97609999, 99969999, 999999998, 999899999, 9998999999, 9999999999, 9999699999, 99999989999, 99998999999
(list; graph; refs; listen; history; internal format)
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