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 A172290 #35 May 08 2024 05:43:27 %S A172290 3,3,5,7,7,13,13,29,43,53,79,113,127,157,313,337,547,911,1093,1093, %T A172290 1249,1429,1613,2731,3121,4733,5419,8191,14449,21841,121369,224771, %U A172290 503413,1210483,1948129,22366891,108749551,112901153,23140471537,25829691707,105310750819,467811806281,4093204977277417,8861085190774909,556338525912325157,86977595801949844993,275700717951546566946854497,292653113147157205779127526827,3194753987813988499397428643895659569 %N A172290 Prime divisors of 2^1092-1, listed with multiplicities. %C A172290 Up to now only two primes p such that p^2 divide 2^(p-1)-1 are known (these two are Wieferich primes, see A001220). %C A172290 The sequence is finite with A001222(2^1092-1) = 49 terms; A001221(2^1092-1) = 45. - _Reinhard Zumkeller_, May 14 2010 %C A172290 Terms appearing more than once (in fact twice) are 3, 7, 13, and 1093. %H A172290 Reinhard Zumkeller, <a href="/A172290/b172290.txt">Table of n, a(n) for n = 1..49</a> (complete sequence) %H A172290 Dario A. Alpern, <a href="https://www.alpertron.com.ar/ECM.HTM">Factorization using the Elliptic Curve Method</a>. %Y A172290 Cf. A001220, A172291, A177855, A046051, A046800, A242715. %K A172290 fini,full,nonn %O A172290 1,1 %A A172290 _Artur Jasinski_, Jan 30 2010 %E A172290 Missing terms a(34) and a(35) inserted by _Reinhard Zumkeller_, May 14 2010 %E A172290 Definition clarified and terms corrected by _Joerg Arndt_, Apr 25 2011