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%I #13 Jan 08 2024 06:55:21
%S 21,13,32,24,43,35,54,46,65,57,76,68,87,79,98,90,10,2,3,4,5,6,7,8,9,
%T 10,2,3,4,5,6,7,8,9,10,2,3,4,5,6,7,8,9,10,2,3,4,5,6,7,8,9,10,2,3,4,5,
%U 6,7,8,9,10,2,3,4,5,6,7,8,9,10,2,3,4,5,6,7,8,9,10,2,3,4,5,6,7,8,9,10,2,3,4,5,6
%N Start with 21 and repeatedly reverse the digits and add 1 to get the next term.
%C After 17 steps 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.
%H <a href="/index/Rec#order_09">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,0,0,0,0,0,0,1).
%Y Cf. A118551.
%Y Essentially the same as A118513.
%K base,nonn,easy
%O 1,1
%A Luc Stevens (lms022(AT)yahoo.com), May 14 2006
%E New a(13)=87 inserted by _Georg Fischer_, Jul 17 2020
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