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 A172291 #16 May 07 2024 14:53:36 %S A172291 3,7,13,1093 %N A172291 Numbers greater than 1 whose square divide 2^1092-1. %C A172291 Up to now only two primes p such that p^2 divides 2^(p-1)-1 are known (these two are Wieferich primes, see A001220). %e A172291 From _Reinhard Zumkeller_, May 14 2010: (Start) %e A172291 a(1)^2 = 9 = A177855(5); %e A172291 a(2)^2 = 49 = A177855(14); %e A172291 a(3)^2 = 169 = A177855(30); %e A172291 a(4)^2 = 1194649 = A177855(1843). (End) %Y A172291 Cf. A001220, A172290. %K A172291 nonn,fini,full %O A172291 1,1 %A A172291 _Artur Jasinski_, Jan 30 2010 %E A172291 Keyword full added by _Reinhard Zumkeller_, May 14 2010