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 A106374 #3 Mar 30 2012 16:50:13 %S A106374 3,11,15,19,23,27,35 %N A106374 Primitive exponents of the Weyl group W(E_7). %D A106374 C. Chevalley, The Betti numbers of the exceptional Lie groups, pp. 21-24 of Proc. Internat Congress Math., Cambridge 1950, Amer. Math. Soc., 1952. %F A106374 Equals 2*A005763(n) + 1. %Y A106374 Cf. A106373, A106403, A005556, A005763, A005776. %K A106374 nonn,fini,full %O A106374 1,1 %A A106374 _N. J. A. Sloane_, May 30 2005