A070524 Value of n-th cyclotomic polynomial at phi(n).
0, 2, 7, 5, 341, 3, 55987, 257, 46873, 205, 11111111111, 241, 9726655034461, 39991, 14709241, 16777217, 19676527011956855057, 46441, 41660902667961039785743, 16519105, 8177824843189, 9090909091, 357686347714896679177439424707
Offset: 1
Examples
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).
Programs
-
Mathematica
Table[Cyclotomic[w, EulerPhi[w]], {w, 1, 25}]