login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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.

Abel Jansma, E_8 Symmetry Structures in the Ising model, Master's thesis, University of Amsterdam, 2018.

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 * A322272 A161850 A007775

Adjacent sequences: A005773 A005774 A005775 * A005777 A005778 A005779

KEYWORD

nonn,fini,full

AUTHOR

N. J. A. Sloane

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 29 06:00 EST 2022. Contains 358422 sequences. (Running on oeis4.)