|
%I #15 May 08 2023 19:45:13
%S 0,10,11,111,101,11111,101,1111111,10001,1001001,10101,11111111111,
%T 10001,1111111111111,1010101,100101001,100000001,11111111111111111,
%U 1000001,1111111111111111111,100010001,1001001001001,10101010101
%N Positions of positive coefficients in cyclotomic polynomial Phi_n(x), A063696 in binary.
%H <a href="/index/Cy#CyclotomicPolynomialsCoefficients">Index entries for cyclotomic polynomials, positions of coefficients</a>
%e 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 0,3,5 and 8, thus we get a(15) = 100101001
%p map(convert, A063696,binary);
%Y Cf. A063699, A063671, A063672.
%K nonn,base
%O 0,2
%A _Antti Karttunen_, Aug 03 2001
%E a(0) corrected by _Sean A. Irvine_, May 08 2023
|
