%I #9 Apr 30 2019 08:24:50

%S 0,1,0,0,0,0,10,0,0,0,1010,0,100,0,101010,10010010,0,0,1000,0,1000100,

%T 100100010010,1010101010,0,10000,0,101010101010,0,10001000100,0,

%U 111000,0,0,10010010010010010010,1010101010101010,100001010010100101000010

%N Positions of negative coefficients in cyclotomic polynomial Phi_n(x), A063698 in binary.

%H <a href="/index/Cy#CyclotomicPolynomialsCoefficients">Index entries for cyclotomic polynomials, positions of coefficients</a>

%e E.g. Phi_15(x) = x^8 - x^7 + x^5 - x^4 + x^3 - x + 1, thus the 1-bits of a(15) are at positions 1,4 and 7, thus we get a(15) = 10010010

%p map(convert, A063698,binary);

%Y Cf. A063697, A063671, A063672.

%K nonn,base

%O 0,7

%A _Antti Karttunen_, Aug 03 2001