[seqfan] R: Number of real roots of polynomial with coefficients +-1, or 0, +-1

Luca Petrone luca.petrone at libero.it
Thu Feb 23 21:28:00 CET 2017


For A282691 the sequence goes on as follows, up to n=17 :
0,1,2,3,2,3,2,5,4,5,4,5,4,5,6,7,6,5
so, apparently there is a mistake for n=7 which IMHO is 5 instead of 3, and 
the "nice" sequence conjectured is not respected.

Luca Petrone

>----Messaggio originale----
>Da: "Neil Sloane" <njasloane at gmail.com>
>Data: 23/02/2017 19.34
>A: "Sequence Fanatics Discussion list"<seqfan at list.seqfan.eu>
>Ogg: [seqfan] Number of real roots of polynomial with coefficients +-1, or 0, 
+-1
>
>https://oeis.org/A282691, A282692, A282693 all need more terms!
>
>--
>Seqfan Mailing list - http://list.seqfan.eu/
>




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