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A051820
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Number of n-digit numbers with nonzero multiplicative digital root 9.
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1
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1, 4, 25, 180, 1640, 17678, 213761, 2572363, 28717151, 295374892, 2863710220, 27059835840, 257084859669, 2498594395926, 24825380748687, 249116120158421
(list; graph; refs; listen; history; internal format)
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