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A193175 Numbers n such that there exists a two-dimensional generalized Bravais lattice with n-fold symmetry. 2
4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 48, 50, 54, 60, 66, 70, 84, 90 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The complete list of 29 terms is shown. These are the values of 2n such that A193179(n)=1.

REFERENCES

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.

LINKS

Table of n, a(n) for n=1..29.

CROSSREFS

Cf. A193176, A193179, A005848.

Sequence in context: A272651 A103517 A163300 * A093161 A111305 A210939

Adjacent sequences:  A193172 A193173 A193174 * A193176 A193177 A193178

KEYWORD

nonn,fini,full

AUTHOR

N. J. A. Sloane, Jul 17 2011

STATUS

approved

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Last modified December 8 09:03 EST 2016. Contains 278906 sequences.