%N Start with 20 and repeatedly reverse the digits and add 1 to get the next term.
%C After 1 step enters a cycle of length 9.
%H N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki.
%Y Cf. A118551.
%A Luc Stevens (lms022(AT)yahoo.com), May 14 2006