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A070518

Value of n-th cyclotomic polynomial at n.

0, 3, 13, 17, 781, 31, 137257, 4097, 532171, 9091, 28531167061, 20593, 25239592216021, 7027567, 2392743361, 4294967297, 51702516367896047761, 34006393, 109912203092239643840221, 25536159601, 7006306553612521, 25405143539623, 949112181811268728834319677753

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OFFSET

1,2

COMMENTS

a(28341) is divisible by 283411^2. What is the next n such that a(n) is not squarefree? - Jianing Song, Nov 01 2024

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..250

Mathematics Stack Exchange, Is the "cyclotomic diagonalization" always squarefree?

Eric Weisstein's World of Mathematics, Cyclotomic Polynomial

EXAMPLE

n=10: 10th cyclotomic polynomial is 1-x+x^2-x^3+x^4; at x=10 it gives a(10)=9091.

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