Trajectory of 13 under map x->x + (x-with-digits-reversed).

Terms

a(0) =13a(1) =44a(2) =88a(3) =176a(4) =847a(5) =1595a(6) =7546a(7) =14003a(8) =44044a(9) =88088a(10) =176176a(11) =847847a(12) =1596595a(13) =7553546a(14) =14007103a(15) =44177144a(16) =88354288a(17) =176599676a(18) =853595347a(19) =1597190705a(20) =6668108656a(21) =13236127322a(22) =35608290553a(23) =71117571206