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 A158816 #4 Jun 02 2025 01:27:25 %S A158816 7,80929,1390916281,2475486361, %T A158816 48009215293052652841860443273079338843737271906291675944391068955229998769420319, %U A158816 626322472637042112379617556574437460372478130091490111806135154280070248067062629972139895896953692975358576879266688023648639640273675162065398163911 %N A158816 Prime factors of 2^843 - 1. %C A158816 The 265 bit factor 48009215293052652841860443273079338843737271906291675944391068955229998769420319 was found in less than 30 seconds by Zhenxiang Zhang's method using a 2GHz Athlon. The entire factorization was completed in 47 seconds. %H A158816 Zhenxiang Zhang, <a href="http://www.crypto-world.com/documents/Fac017FQ.ps">Using Lucas Sequences to Factor Large Integers Near Group Orders</a>, 1999 %Y A158816 Cf. A000040, A000225 %K A158816 fini,full,nonn %O A158816 1,1 %A A158816 _Reikku Kulon_, Mar 27 2009