This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A075108 #6 Oct 27 2018 22:44:51 %S A075108 2,3,2,60,3,14,8,3,1484710602474311520,220,4,227370,560,5,4,218790, %T A075108 268065,570,5,1008,33,1458660,6,1925,2093,2268,7,58,60,62,2016, %U A075108 494764640798827359861461484,5220768,7 %N A075108 First integer reached when starting with n/floor(log_2(n)) and iterating the map x -> x*ceiling(x) A075107(n) times, or -1 if no integer is ever reached. %e A075108 n=5: after A075107(5)=2 steps 5/floor(log_2(5)) = 5/2 -> 15/2 -> 60, therefore a(5)=60. %Y A075108 Cf. A075103, A075121. %K A075108 nonn %O A075108 2,1 %A A075108 _Reinhard Zumkeller_, Sep 02 2002