A134518 Least k such that the cyclotomic polynomial Phi(k,x) contains n or -n as a coefficient, where k is restricted to be the product of 3 distinct prime numbers.

105, 385, 2431, 2717, 8671, 17119, 19499, 20213, 20213, 34891, 34891, 93439, 93439, 93439, 93439, 93439, 282367, 282367, 282367, 282367, 282367, 282367, 282367, 282367, 282367, 617927, 617927, 849647, 849647, 849647, 849647, 849647, 874507

Offset: 2

Author

T. D. Noe, Oct 29 2007

Keywords

• nonn

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

Cf. A007304, A013594.