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A005776 Exponents m_i associated with Weyl group W(E_8). 15
1, 7, 11, 13, 17, 19, 23, 29 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Numbers coprime to 30 in that number's reduced residue system. - Alonso del Arte, Oct 03 2017

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.

LINKS

Table of n, a(n) for n=1..8.

Index entries for sequences related to groups

MATHEMATICA

Select[Range[30], GCD[30, #] == 1 &] (* Alonso del Arte, Oct 03 2017 *)

PROG

(MAGMA) Exponents(RootDatum("E8")); // Sergei Haller (sergei(AT)sergei-haller.de), Dec 21 2006

(PARI) select(n->gcd(n, 30)==1. [1..29]) \\ Charles R Greathouse IV, Oct 17 2017

CROSSREFS

Cf. A005556 (E_6), A005763 (E_7), A106373, A106374, A106403, A048597.

Sequence in context: A191988 A128974 A286609 * A161850 A007775 A070884

Adjacent sequences:  A005773 A005774 A005775 * A005777 A005778 A005779

KEYWORD

nonn,fini,full

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified October 21 20:51 EDT 2018. Contains 316428 sequences. (Running on oeis4.)