

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
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OFFSET

2,1


COMMENTS

It is wellknown 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 22232237.


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



