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 A008869 #15 Jul 08 2025 01:21:23 %S A008869 7997476042075799759100487262680802918400, %T A008869 2542750473636273484480959502278043289108758407541532509234790400 %N A008869 Order of universal Chevalley group E_7 (q), q = prime power. %D A008869 J. H. Conway, R. T. Curtis, S. P. Norton, R. A. Parker and R. A. Wilson, ATLAS of Finite Groups. Oxford Univ. Press, 1985 [for best online version see https://oeis.org/wiki/Welcome#Links_to_Other_Sites], p. xvi. %D A008869 H. S. M. Coxeter and W. O. J. Moser, Generators and Relations for Discrete Groups, 4th ed., Springer-Verlag, NY, reprinted 1984, p. 131. %p A008869 q^63*(q^2-1)*(q^6-1)*(q^8-1)*(q^10-1)*(q^12-1)*(q^14-1)*(q^18-1); %Y A008869 Cf. A178781. %K A008869 nonn,easy,bref %O A008869 1,1 %A A008869 _N. J. A. Sloane_