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NestList[FromDigits[IntegerDigits[#, 9]]&, 9, 53] (* - __Zak Seidov_, Apr 18 2014 *)
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nonn,base,changed
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Vincenzo Librandi, <a href="/A023392/b023392.txt">Table of n, a(n) for n = 1..160</a>
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reviewed
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