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A043528
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Numbers n such that number of 9's in base 10 is 4.
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9999, 19999, 29999, 39999, 49999, 59999, 69999, 79999, 89999, 90999, 91999, 92999, 93999, 94999, 95999, 96999, 97999, 98999, 99099, 99199, 99299, 99399, 99499, 99599, 99699, 99799, 99899, 99909, 99919, 99929, 99939
(list; graph; refs; listen; history; internal format)
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