A033675 Trajectory of 166 under map x->x + (x-with-digits-reversed).

166, 827, 1555, 7106, 13123, 45254, 90508, 171017, 881188, 1762376, 8495047, 15900995, 75801946, 140712803, 448929844, 897859688, 1784818486, 8633003357, 16166006725, 68926072886, 137753135872