OFFSET
0,61
COMMENTS
Periodic with period length 2223. - Ray Chandler, Apr 07 2017
LINKS
FORMULA
From Robert Israel, Apr 19 2016: (Start)
G.f.: 1/C_2223(x), where C_n(x) is the n-th cyclotomic polynomial.
a(n) = 0 if n is not divisible by 3.
a(3*n) = A014750(n).- (End)
MAPLE
with(numtheory, cyclotomic); c := n->series(1/cyclotomic(n, x), x, 80);
MATHEMATICA
CoefficientList[Series[1/Cyclotomic[2223, x], {x, 0, 120}], x] (* Harvey P. Dale, Jan 30 2019 *)
CROSSREFS
KEYWORD
sign
AUTHOR
STATUS
approved