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 A074923 #9 Feb 03 2025 00:14:01 %S A074923 1,6,18,5,5,7,37,132,29,63,46,11,7,212,25,38,145,136,46,118,39,37,24, %T A074923 15,19,85,211,179,249,266,190,87,259,216,16,70,210,56,255,94,143,244, %U A074923 482,558,46,327,271,93,110,8,121,29,421,329,47,40,394,376,64,249,49,390,321 %N A074923 Number of steps to reach the first integer starting with prime(n+1)/prime(n) and iterating the map x -> x*ceiling(x), or -1 if no integer is ever reached. %H A074923 Sean A. Irvine, <a href="/A074923/b074923.txt">Table of n, a(n) for n = 1..200</a> %e A074923 a(4)=5 since A000040(4+1)/A000040(4)=11/7 -> 22/7 -> 88/7 -> 1144/7 -> 187616/7 -> 718381664. %Y A074923 Cf. A073524, A000040. %K A074923 nonn %O A074923 1,2 %A A074923 _Reinhard Zumkeller_, Oct 04 2002 %E A074923 Extended by _Max Alekseyev_, Jul 28 2009