%I #13 Jun 14 2024 22:31:09
%S 7997476042075799759100487262680802918400,
%T 2542750473636273484480959502278043289108758407541532509234790400
%N Order of universal Chevalley group E_7 (q), q = prime power.
%D 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 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 q^63*(q^2-1)*(q^6-1)*(q^8-1)*(q^10-1)*(q^12-1)*(q^14-1)*(q^18-1);
%Y Cf. A178781.
%K nonn,easy,bref
%O 1,1
%A _N. J. A. Sloane_.