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Start with 1 and repeatedly reverse the digits and add 19 to get the next term.
0

%I #6 Jul 20 2015 11:24:30

%S 1,20,21,31,32,42,43,53,54,64,65,75,76,86,87,97,98,108,820,47,93,58,

%T 104,420,43,53,54,64,65,75,76,86,87,97,98,108,820,47,93,58,104,420,43,

%U 53,54,64,65,75,76,86,87,97,98,108,820,47,93,58,104,420,43,53,54,64,65,75,76

%N Start with 1 and repeatedly reverse the digits and add 19 to get the next term.

%C After 6 steps enters a cycle of length 18.

%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_18">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1).

%Y Cf. A117828, A117816, A117817.

%K base,nonn

%O 1,2

%A Luc Stevens (lms022(AT)yahoo.com), May 08 2006