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A239048
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1 plus the n-th divisor of 24.
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1
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OFFSET
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1,1
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COMMENTS
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Also Coxeter number (denoted m(X)) of the Niemeier lattices X whose root systems are of pure A-type according to the ADE classification; see Ono-Rolen-Trebat paper, page 3, Table 1, Pure A-type root systems.
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REFERENCES
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J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, 3rd. ed., 1993. Table 16.1, p. 407.
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LINKS
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FORMULA
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MATHEMATICA
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CROSSREFS
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KEYWORD
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nonn,easy,fini,full
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AUTHOR
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STATUS
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approved
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