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 A003928 #17 Jul 11 2025 14:05:43
%S A003928 60,4680000,228501000000000,6973279267500000000000000,
%T A003928 133004733151172695312500000000000000000,
%U A003928 1585539968089882234636505126953125000000000000000000000
%N A003928 Order of simple Chevalley group B_n (5).
%H A003928 <a href="/index/Gre#groups">Index entries for sequences related to groups</a>.
%F A003928 a(n) = b(5,n) where b(q,n) is defined in A003927. - _Sean A. Irvine_, Sep 22 2015
%F A003928 a(n) ~ c * 5^(2*n^2+n)/2, where c = Product_{k>=1} (1 - 1/5^(2*k)) = 0.958400102563... . - _Amiram Eldar_, Jul 11 2025
%t A003928 b[q_, n_] := q^(n^2) * Product[q^(2*k) - 1, {k, 1, n}] / GCD[2, q-1]; Table[b[5, n], {n, 1, 6}] (* _Amiram Eldar_, Jul 11 2025 *)
%Y A003928 Cf. A003927, A003929, A003930.
%K A003928 nonn
%O A003928 1,1
%A A003928 _N. J. A. Sloane_