OFFSET
0,1
COMMENTS
Periodic with period length 506. - Ray Chandler, Apr 04 2017
In general the expansion of 1/Phi(N) is N-periodic, but also satisfies a linear recurrence of lower order given by degree(Phi(N)) = phi(N) = A000010(N) < N. The signature is given by the coefficients of (1-Phi(N)). - M. F. Hasler, Feb 18 2018
LINKS
MAPLE
with(numtheory, cyclotomic); c := n->series(1/cyclotomic(n, x), x, 80);
MATHEMATICA
CoefficientList[Series[1/Cyclotomic[506, x], {x, 0, 120}], x, 120] (* Harvey P. Dale, Feb 13 2022 *)
CROSSREFS
KEYWORD
sign
AUTHOR
STATUS
approved