OFFSET

1,8

COMMENTS

FORMULA

EXAMPLE

n=1: C(1,x) has only the zero -2, therefore a(1)=1.

n=2: C(2,x) has only a vanishing zero, therefore a(2)=0.

n=5: C(5,x) has the negative zero 2*cos(3*Pi/5) = -2*cos(2*Pi/5)=-(phi-1) with the golden section phi, therefore a(5)=1.

n=8: C(8,x) has the two negative zeros 2*cos(5*Pi/8) =

-2*cos(3*Pi/8) = -sqrt(2-sqrt(2)) and 2*cos(7*Pi/8) =

-2*cos(Pi/8)= -sqrt(2+sqrt(2)), therefore a(8)=2.

CROSSREFS

KEYWORD

nonn

AUTHOR

Wolfdieter Lang, Aug 02 2011

STATUS

approved