

A330584


The orders, with repetition, of the noncyclic finite simple groups that are subquotients of the automorphism groups of sublattices of the Leech lattice.


2



60, 168, 360, 504, 660, 1092, 2448, 2520, 3420, 4080, 5616, 6048, 6072, 7800, 7920, 20160, 20160, 25920, 62400, 95040, 126000, 181440, 443520, 604800, 979200, 1451520, 1814400, 3265920, 4245696, 10200960
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OFFSET

1,1


COMMENTS

Note: not every sublattice of the Leech lattice is necessarily a section of the Leech lattice. For example, every Niemeyer lattice is commensurable with the Leech lattice; thus the orders of the simple components of their automorphism groups are in this list, even when those groups are not sections of Co0.
By a theorem of Conway and Sloane, any simple group with a cover that has a crystallographic representation in <= 21 dimensions is in this list.
This is a subsequence of A330583.


REFERENCES

J. H. Conway, R. T. Curtis, S. P. Norton, R. A. Parker and R. A. Wilson, ATLAS of Finite Groups. Oxford Univ. Press, 1985.
J. H. Conway, N. J. A. Sloane, Sphere Packings, Lattices, and Groups. Springer, 3rd ed., 1999.


LINKS

Hal M. Switkay, Table of n, a(n) for n = 1..56
J. H. Conway, N. J. A. Sloane, Lowdimensional lattices V: Integral coordinates for integral lattices, Proc. Royal Soc. A 426 (1989), 211232.
David A. Madore, Orders of nonabelian simple groups
R. A. Wilson et al., ATLAS of Finite Group Representations  Version 3


EXAMPLE

All simple groups of order less than 9828 have crystallographic representations within sublattices of the Leech lattice. The smallest nontrivial crystallographic representation of L2(27), of order 9828, is 26dimensional.


CROSSREFS

Cf. A109379, A080683, A330583.
Sequence in context: A001034 A330583 A330585 * A330586 A119630 A216480
Adjacent sequences: A330581 A330582 A330583 * A330585 A330586 A330587


KEYWORD

nonn,fini,full


AUTHOR

Hal M. Switkay, Dec 18 2019


STATUS

approved



