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

Terms

a(0) =166a(1) =827a(2) =1555a(3) =7106a(4) =13123a(5) =45254a(6) =90508a(7) =171017a(8) =881188a(9) =1762376a(10) =8495047a(11) =15900995a(12) =75801946a(13) =140712803a(14) =448929844a(15) =897859688a(16) =1784818486a(17) =8633003357a(18) =16166006725a(19) =68926072886a(20) =137753135872