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%I #3 Mar 30 2012 16:50:13
%S 3,9,11,15,17,23
%N Primitive exponents of the Weyl group W(E_6).
%D 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 Equals 2*A005556(n) + 1.
%Y Cf. A106374, A106403, A005556, A005763, A005776.
%K nonn,fini,full
%O 1,1
%A _N. J. A. Sloane_, May 30 2005
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