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 A193943 #43 Jul 09 2025 04:33:20 %S A193943 1,8,80,4374,9800,123200,336140,11859210,177182720,1611308699, %T A193943 3463199999,63927525375,421138799639,1109496723125,1453579866024, %U A193943 20628591204480,31887350832896,119089041053696,2286831727304144,9591468737351909375,19316158377073923834000 %N A193943 Integers n such that for all i > n the largest prime factor of i*(i+1) exceeds the largest prime factor of n*(n+1). %H A193943 Andrey V. Kulsha, <a href="/A193943/b193943.txt">Table of n, a(n) for n = 1..23</a> %H A193943 liangbch, <a href="https://bbs.emath.ac.cn/thread-4652-1-1.html">consecutive pairs of smooth numbers</a>, Blog. %Y A193943 Cf. A002072, A145606, A193944. %K A193943 nonn %O A193943 1,2 %A A193943 _Andrey V. Kulsha_, Aug 11 2011, according to Jim White's computations %E A193943 Corrected 23rd term in b-file (see Blog link), _Andrey V. Kulsha_, Dec 22 2014 %E A193943 a(20) and a(21) added (from b-file) by _Jon E. Schoenfield_, Apr 22 2018