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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. 2
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 (list; graph; refs; listen; history; text; internal format)
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

Table of n, a(n) for n=2..34.

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.

Sequence in context: A013594 A160340 A136418 * A160717 A165056 A165060

Adjacent sequences:  A134515 A134516 A134517 * A134519 A134520 A134521

KEYWORD

nonn

AUTHOR

T. D. Noe, Oct 29 2007

STATUS

approved

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Last modified April 5 23:13 EDT 2020. Contains 333260 sequences. (Running on oeis4.)