%I A019320
%S A019320 2,1,3,7,5,31,3,127,17,73,11,2047,13,8191,43,151,257,131071,
%T A019320 57,524287,205,2359,683,8388607,241,1082401,2731,262657,
%U A019320 3277,536870911,331,2147483647,65537,599479,43691,8727391
%N A019320 Cyclotomic polynomials at x=2.
%H A019320 T. D. Noe, <a href="b019320.txt">Table of n, a(n) for n=0..1000</a>
%H A019320 Joerg Arndt, <a href="http://www.jjj.de/fxt/#fxtbook">Fxtbook</a>
%H A019320 <a href="Sindx_Cy.html#CyclotomicPolynomialsValuesAtX">Index entries 
               for cyclotomic polynomials, values at X</a>
%F A019320 LCM{2^k - 1, k=1..n}/LCM{2^k - 1, k=1..n-1}, n >1. - Vladeta Jovovic 
               (vladeta(AT)eunet.rs), Jan 20 2002
%p A019320 with(numtheory,cyclotomic); f := n->subs(x=2,cyclotomic(n,x)); seq(f(i),
               i=0..64);
%Y A019320 A019320[n] = A063696[n]-A063698[n] for up to n=104. Same sequence in 
               binary: A063672. Cf. A054432, A020501.
%Y A019320 Cf. A034268.
%Y A019320 Sequence in context: A058170 A127896 A010757 this_sequence A033640 A112027 
               A024404
%Y A019320 Adjacent sequences: A019317 A019318 A019319 this_sequence A019321 A019322 
               A019323
%K A019320 nonn
%O A019320 0,1
%A A019320 Simon Plouffe (simon.plouffe(AT)gmail.com)