OFFSET
1,2
EXAMPLE
n=6: the 6th cyclotomic polynomial is 1 - x + xx, phi(6)=2, C(6, phi(6)) = C(6,2) = 1 - 2 + 4 = 3 = a(6).
MATHEMATICA
Table[Cyclotomic[w, EulerPhi[w]], {w, 1, 25}]
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Labos Elemer, May 02 2002
STATUS
approved