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A019438
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Squarefree orders of elements of Mathieu group M_23.
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0
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OFFSET
| 0,2
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COMMENTS
| Numbers having a unique partition into four nonnegative squares. Let r=2, 6, or 14. Then the numbers r*4^k also have unique partitions into the four nonnegative squares for k>0. See A006431. - T. D. Noe (noe(AT)sspectra.com), Aug 10 2005
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REFERENCES
| D. H. Lehmer, On the partition of numbers into squares, Amer. Math. Monthly, Vol. 55, No. 8 (Oct 1948), 476-481.
G. Nebe and M. Teider, Hecke actions on certain strongly modular genera of lattices. Archiv der Mathematik 84 (1) (2005) 46-56.
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LINKS
| E. M. Rains and N. J. A. Sloane, The Shadow Theory of Modular and Unimodular Lattices, J. Number Theory, 73 (1998), 359-389.
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CROSSREFS
| Sequence in context: A053813 A116974 A031402 * A023798 A062084 A098959
Adjacent sequences: A019435 A019436 A019437 * A019439 A019440 A019441
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KEYWORD
| nonn,fini,full
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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