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Start with 1 and repeatedly reverse the digits and add 2 to get the next term.
11

%I #7 Jul 19 2015 17:57:16

%S 1,3,5,7,9,11,13,33,35,55,57,77,79,99,101,103,303,305,505,507,707,709,

%T 909,911,121,123,323,325,525,527,727,729,929,931,141,143,343,345,545,

%U 547,747,749,949,951,161,163,363,365,565,567,767,769,969,971,181,183,383,385,585,587,787,789,989,991,201,104,403,306,605,508,807,710,19,93,41,16,63,38,85,60,8,10,3,5,7,9,11,13,33,35,55,57,77,79,99,101,103,303,305,505,507,707

%N Start with 1 and repeatedly reverse the digits and add 2 to get the next term.

%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_81">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, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1).

%F After 1 step enters a cycle of length 81.

%Y Cf. A117831, A118514.

%K nonn,base

%O 1,2

%A _N. J. A. Sloane_, following discussions with Luc Stevens, May 04 2006