OFFSET
2,3
LINKS
Trevor Hyde, Cyclotomic factors of necklace polynomials, arXiv:1811.08601 [math.CO], 2018.
EXAMPLE
Triangle begins:
[1]
[1, 2]
[1, 2]
[1, 2, 4]
[1, 2]
[1, 2, 3, 6]
[1, 2, 4]
[1, 2, 3, 6]
[1, 2, 4, 6]
[1, 2, 5, 10]
[1, 2, 4]
...
PROG
(PARI) M(n) = sumdiv(n, d, moebius(d)*x^(n/d));
row(n) = my(list=List(), pol=M(n)); for (k=1, n, if (type(pol/polcyclo(k)) == "t_POL", listput(list, k))); Vec(list);
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Michel Marcus, Aug 24 2021
STATUS
approved