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 A075121 #14 Jan 15 2022 23:35:28 %S A075121 1,2,3,2,60,3,14,4,3,1484710602474311520,220,4,227370,560,5,4,218790, %T A075121 268065,570,5,1008,33,1458660,6,5 %N A075121 First integer reached when starting with n/floor(sqrt(n)) and iterating the map x -> x*ceiling(x) A075120(n) times, or -1 if no integer is ever reached. %C A075121 a(26) = 9.20120538...*10^191 is too large to be included in Data. - _Jinyuan Wang_, Jan 15 2022 %H A075121 Jinyuan Wang, <a href="/A075121/b075121.txt">Table of n, a(n) for n = 1..50</a> %e A075121 n=13: after A075120(13)=3 steps 13/floor(sqrt(13)) = 13/3 -> 65/3 -> 1430/3 -> 227370, therefore a(13)=227370. %Y A075121 Cf. A075103, A075108, A075120. %K A075121 nonn %O A075121 1,2 %A A075121 _Reinhard Zumkeller_, Sep 03 2002