10*(10^n-1).
0, 90, 990, 9990, 99990, 999990, 9999990, 99999990, 999999990, 9999999990
1 seqfan posts
Thu Oct 20 11:56:18 CEST 2011 [seqfan] Re: Anagram sequence
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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