OFFSET
2,1
COMMENTS
It is well-known that k=105 is the first number for which Phi(k,x) has a coefficient other than -1, 0, or 1. See A013594 for the case when k has no restrictions.
LINKS
Jia Zhao and Xianke Zhang, Coefficients of ternary cyclotomic polynomials, Journal of Number Theory, Volume 130, Issue 10, October 2010, Pages 2223-2237.
CROSSREFS
KEYWORD
nonn
AUTHOR
T. D. Noe, Oct 29 2007
STATUS
approved