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%I #17 Mar 30 2012 16:52:03
%S 4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,48,50,54,
%T 60,66,70,84,90
%N Numbers n such that there exists a two-dimensional generalized Bravais lattice with n-fold symmetry.
%C The complete list of 29 terms is shown. These are the values of 2n such that A193179(n)=1.
%D Mermin, N. David; Rokhsar, Daniel S.; and Wright, David C.; Beware of 46-fold symmetry: the classification of two-dimensional quasicrystallographic lattices. Phys. Rev. Lett. 58 (1987), 2099-2101.
%Y Cf. A193176, A193179, A005848.
%K nonn,fini,full
%O 1,1
%A _N. J. A. Sloane_, Jul 17 2011
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