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A005796 Degrees of fundamental invariants of Weyl group W(E_8). +0
1
2, 8, 12, 14, 18, 20, 24, 30 (list; graph; listen)
OFFSET

1,1

COMMENT

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]

REFERENCES

H. S. M. Coxeter and W. O. J. Moser, Generators and Relations for Discrete Groups, 4th ed., Springer-Verlag, NY, reprinted 1984, p. 141.

FORMULA

a(n) = Prime(n+2) + 1, for n = 2, 3, ..., 8. [From Jonathan Sondow (jsondow(AT)alumni.princeton.edu), Apr 16 2009]

CROSSREFS

Sequence in context: A043377 A107629 A080058 this_sequence A086173 A108725 A108059

Adjacent sequences: A005793 A005794 A005795 this_sequence A005797 A005798 A005799

KEYWORD

nonn,fini,full

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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