%I #3 Oct 01 2013 17:58:19
%S 1,2,2,2,2,3,3,3,3,3,4,4,4,4,5,5,5,5,5,6,6,6,6,6,7,7,7,7,7,8,8,8,8,8,
%T 9,9,9,9,9,10,10,10,10,10,10,11,11,11,11,11,12,12,12,12,12,12,13,13,
%U 13,13,13,13,14,14,14,14,14,14,15,15,15,15,15,15,16,16,16,16,16,16,17,17,17
%N Floor(R(2n) - R(n)).
%F R(x) = Riemann Pi(x) approximation
%o (PARI) p(n) = for(x=2,n,y=R(2*x)-R(x);print1(floor(y)",")) R(x) = \ Riemann approx of Pi(x) { local(j); round(sum(j=1,200,moebius(j)*Li(x^(1/j))/j)) }
%K easy,nonn
%O 2,2
%A _Cino Hilliard_, Jul 22 2005