Trajectory of 25 under map x->x + (x-with-digits-reversed).

Terms

a(0) =25a(1) =77a(2) =154a(3) =605a(4) =1111a(5) =2222a(6) =4444a(7) =8888a(8) =17776a(9) =85547a(10) =160105a(11) =661166a(12) =1322332a(13) =3654563a(14) =7309126a(15) =13528163a(16) =49710694a(17) =99312488a(18) =187733887a(19) =976071668a(20) =1842242347a(21) =9274664828a(22) =17559329557a(23) =93151725128