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 A005776 #45 Apr 04 2024 14:04:41
%S A005776 1,7,11,13,17,19,23,29
%N A005776 Exponents m_i associated with Weyl group W(E_8).
%C A005776 Numbers coprime to 30 in that number's reduced residue system. - _Alonso del Arte_, Oct 03 2017
%D A005776 H. S. M. Coxeter and W. O. J. Moser, Generators and Relations for Discrete Groups, 4th ed., Springer-Verlag, NY, reprinted 1984, p. 141.
%H A005776 Abel Jansma, <a href="https://abeljansma.nl/assets/mscThesis.pdf">E_8 Symmetry Structures in the Ising model</a>, Master's thesis, University of Amsterdam, 2018.
%H A005776 <a href="/index/Gre#groups">Index entries for sequences related to groups</a>.
%t A005776 Select[Range[30], GCD[30, #] == 1 &] (* _Alonso del Arte_, Oct 03 2017 *)
%o A005776 (Magma) Exponents(RootDatum("E8")); // Sergei Haller (sergei(AT)sergei-haller.de), Dec 21 2006
%o A005776 (PARI) select(n->gcd(n,30)==1, [1..29]) \\ _Charles R Greathouse IV_, Oct 17 2017
%Y A005776 Cf. A005556 (E_6), A005763 (E_7), A106373, A106374, A106403, A048597.
%K A005776 nonn,fini,full
%O A005776 1,2
%A A005776 _N. J. A. Sloane_