ddx[(x+1)(x2+1)(x4+1)(x8+1)]=(15xp−16xq+1)(x−1)−2 ⇒(p,q)=
(12, 11)
(15, 14)
(16, 14)
(16, 15)
ddx[x16−1x−1]=15x16−16x15+1(x−1)2 ⇒(p,q)=(16,15)