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 A008913 #17 Jul 08 2025 01:23:59
%S A008913 3311126603366400,5734420792816671844761600,
%T A008913 19009825523840945451297669120000,
%U A008913 2131486317725501953125000000000000000,86325573304608766361629193317905069834240000
%N A008913 Order of simple Chevalley group F_4(q), q = prime power.
%D A008913 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 A008913 H. S. M. Coxeter and W. O. J. Moser, Generators and Relations for Discrete Groups, 4th ed., Springer-Verlag, NY, reprinted 1984, p. 131.
%D A008913 R. L. Griess, Jr., Twelve Sporadic Groups, Springer, 1998; see p. 169.
%p A008913 q^24*(q^2-1)*(q^6-1)*(q^8-1)*(q^12-1);
%t A008913 Table[q^24*(q^2-1)*(q^6-1)*(q^8-1)*(q^12-1), {q, Select[Range[7], PrimePowerQ]}] (* _Jean-François Alcover_, Aug 24 2022 *)
%Y A008913 Cf. A178779.
%K A008913 nonn,easy
%O A008913 1,1
%A A008913 _N. J. A. Sloane_