OFFSET
1,1
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
FORMULA
a(n) = Prime(n+2) + 1, for n = 2, 3, ..., 8. [Jonathan Sondow, Apr 16 2009]
CROSSREFS
KEYWORD
nonn,fini,full
AUTHOR
STATUS
approved