Trajectory of 69 under map x->x + (x-with-digits-reversed).

Terms

a(0) =69a(1) =165a(2) =726a(3) =1353a(4) =4884a(5) =9768a(6) =18447a(7) =92928a(8) =175857a(9) =934428a(10) =1758867a(11) =9447438a(12) =17794887a(13) =96644658a(14) =182289327a(15) =906271608a(16) =1712444217a(17) =8836886388a(18) =17673772776a(19) =85401510447a(20) =159803020905a(21) =668823329856