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 A003853 #23 Jun 24 2025 11:03:13
%S A003853 1691555775522928280469504000,
%T A003853 11470635634813395742481912276441576767488000,
%U A003853 5722569627753465177061732369386833143098255605760000000,967724409898859060146424426078796386718750000000000000000000000,39242041156758982253792290541798244252619818128923898602839750047956992000000
%N A003853 Order of simple Chevalley group D_7(q), q = prime power.
%D A003853 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 A003853 H. S. M. Coxeter and W. O. J. Moser, Generators and Relations for Discrete Groups, 4th ed., Springer-Verlag, NY, reprinted 1984, p. 131.
%H A003853 <a href="/index/Gre#groups">Index entries for sequences related to groups</a>.
%F A003853 a(n) = d(A000961(n+1),7) where d(q,n) is defined in A003837. - _Sean A. Irvine_, Sep 17 2015
%t A003853 d[q_, n_] := q^(n*(n-1)) * (q^n-1) * Product[q^(2*k) - 1, {k, 1, n-1}] / GCD[4, q^n-1]; Table[d[q, 7], {q, Select[Range[10], PrimePowerQ]}] (* _Amiram Eldar_, Jun 24 2025 *)
%Y A003853 Cf. A003846. - _R. J. Mathar_, Oct 28 2008
%Y A003853 Cf. A000961, A003808, A003837, A003848, A003850, A003851, A003852, A003854.
%K A003853 nonn,easy
%O A003853 1,1
%A A003853 _N. J. A. Sloane_
%E A003853 More terms from _Sean A. Irvine_, Sep 17 2015