Timeline for Cyclotomic polynomials with 7$^{th}$ coefficient greater than 1 in absolute value
Current License: CC BY-SA 3.0
2 events
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| Dec 2, 2015 at 19:14 | comment | added | Yusuf Gurtas | yes it's because the odd ones are prime for which $\mu(k)=-1$ and the even ones are 2 times a prime in which case $\mu(k/2)=-1$ . For both cases @Ofir proved that the answer is 0. You have to go as high as 143 to see a $-2$ and as high as 286 to see a $2$. Other examples under 300 for a $-2$ are 187,209,221,247,253,299. If you double those numbers you will see a 2. | |
| Dec 2, 2015 at 17:45 | history | answered | Stefan Kohl♦ | CC BY-SA 3.0 |