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Search: id:A005796
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| A005796 |
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Degrees of fundamental invariants of Weyl group W(E_8). |
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+0
1
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OFFSET
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1,1
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COMMENT
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a(n) - 1 is the nth number < 30 that is relatively prime to 30. [From Jonathan Sondow (jsondow(AT)alumni.princeton.edu), Apr 16 2009]
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REFERENCES
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H. S. M. Coxeter and W. O. J. Moser, Generators and Relations for Discrete Groups, 4th ed., Springer-Verlag, NY, reprinted 1984, p. 141.
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FORMULA
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a(n) = Prime(n+2) + 1, for n = 2, 3, ..., 8. [From Jonathan Sondow (jsondow(AT)alumni.princeton.edu), Apr 16 2009]
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CROSSREFS
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Sequence in context: A043377 A107629 A080058 this_sequence A086173 A108725 A108059
Adjacent sequences: A005793 A005794 A005795 this_sequence A005797 A005798 A005799
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KEYWORD
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nonn,fini,full
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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