A005796 Degrees of fundamental invariants of Weyl group W(E_8).

2, 8, 12, 14, 18, 20, 24, 30

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• fini
• full

Comments

a(n) - 1 is the n-th number < 30 that is relatively prime to 30. [Jonathan Sondow, Apr 16 2009]

Links

• H. S. M. Coxeter and W. O. J. Moser, Generators and Relations for Discrete Groups, 4th ed., Springer-Verlag, NY, reprinted 1984, p. 141.
• G. J. Fox, Letter to N. J. A. Sloane, May 1991 [The notes on this letter reference this A-number but actually it contains a different sequence, which is not currently in the OEIS. - _Andrey Zabolotskiy_, Dec 09 2024]

Crossrefs

Cf. A273867, A005795.

Formula

a(n) = Prime(n+2) + 1, for n = 2, 3, ..., 8. [Jonathan Sondow, Apr 16 2009]