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 A075120 #12 Jan 16 2022 08:30:44 %S A075120 0,0,0,0,2,0,1,0,0,5,2,0,3,2,0,0,3,3,2,0,2,1,3,0,0,8,3,5,2,0,3,2,5,3, %T A075120 0,0,6,2,2,4,2,0,5,3,1,4,2,0,0,7,12,5,11,12,2,0,4,3,9,12,6,16,0,0,3,7, %U A075120 8,4,4,4,2,0,2,4,5,1,5,2,5,0,0,7,3,22,3,3 %N A075120 Number of steps to reach the first integer (= A075121(n)) starting with n/floor(sqrt(n)) and iterating the map x -> x*ceiling(x), or -1 if no integer is ever reached. %C A075120 Starting with A073890(n)/A075119(n). %e A075120 a(13)=3 since 13/floor(sqrt(13)) = 13/3 -> 65/3 -> 1430/3 -> 227370 = A075121(13). %Y A075120 Cf. A068119, A073524, A075102, A075107, A075121. %K A075120 nonn %O A075120 1,5 %A A075120 _Reinhard Zumkeller_, Sep 03 2002 %E A075120 More terms from _Jinyuan Wang_, Jan 15 2022