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%I #14 Jan 03 2019 13:26:48
%S 2102222,11102222,12022222,120022222,202022221,1200022222,2002022221,
%T 2020022221,12000022222,20200022221,202000022221
%N Complete list of numbers that take three steps to collapse to a single digit in base 3 (written in base 3).
%H Steve Butler, R. L. Graham, Richard Stong, <a href="http://www.math.ucsd.edu/~ronspubs/mis_17_bases.pdf">Collapsing numbers in bases 2, 3, and beyond</a>, in Gathering for Gardner 10, 2014.
%Y Cf. A253057.
%K nonn,fini,full
%O 1,1
%A _N. J. A. Sloane_, Jan 13 2015
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