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a(9) added by _Ian Duff, _, Jan 03 2012
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For n=5: 142857*5=714285 . [From Dzmitry Paulenka (pavlenko(AT)tut.by), Aug 09 2009]
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a(n) = n(10^m-1)/(10n-1), where m (=A094224) is the order of 10 modulo 10n-1. - Moses Liskov (mliskov(AT)cs.wm.edu), May 17 2006
Incorrect formula removed by Alois P. Heinz, Feb 18 2020
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