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

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`%I #6 Jul 20 2015 11:24:30
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`%S 1,20,21,31,32,42,43,53,54,64,65,75,76,86,87,97,98,108,820,47,93,58,
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`%T 104,420,43,53,54,64,65,75,76,86,87,97,98,108,820,47,93,58,104,420,43,
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`%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
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`%N Start with 1 and repeatedly reverse the digits and add 19 to get the next term.
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`%C After 6 steps enters a cycle of length 18.
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`%H N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki.
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`%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).
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`%Y Cf. A117828, A117816, A117817.
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`%K base,nonn
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`%O 1,2
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`%A Luc Stevens (lms022(AT)yahoo.com), May 08 2006
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