A033674 Trajectory of 99 under map x->x + (x-with-digits-reversed).
99, 198, 1089, 10890, 20691, 40293, 79497, 158994, 658845, 1207701, 2284722, 4559544, 9019098, 17928207, 88211178, 175322466, 839546037, 1570191975, 7362102726, 13634115363, 49985258994, 99970517988
Offset: 0
Programs
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Mathematica
NestList[IntegerReverse[#]+#&,99,30] (* The program uses the IntegerReverse function from Mathematica version 10 *) (* Harvey P. Dale, Dec 05 2015 *)
Formula
a(n)=A033659(n+1). [From R. J. Mathar, Oct 22 2008]