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%I #14 Dec 16 2021 15:20:07
%S 21,33,66,132,363,726,1353,4884,9768,18447,92928,175857,934428,
%T 1758867,9447438,17794887,96644658,182289327,906271608,1712444217,
%U 8836886388,17673772776,85401510447,159803020905
%N Trajectory of 21 under map x->x + (x-with-digits-reversed).
%H <a href="/index/Res#RAA">Index entries for sequences related to Reverse and Add!</a>
%F a(n) = A033653(n-1), n>1. [From _R. J. Mathar_, Oct 22 2008]
%t NestList[#+IntegerReverse[#]&,21,30] (* _Harvey P. Dale_, Dec 16 2021 *)
%K nonn,base
%O 0,1
%A _N. J. A. Sloane_.
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