%I #3 Mar 30 2012 18:50:20
%S -1,0,-1,1,-3,1,-5,4,3,1,-9,5,-11,1,1,12,-15,6,-17,7,-1,1,-21,16,-5,1,
%T 27,9,-27,8,-29,32,-5,1,-11,21,-35,1,-7,24,-39,10,-41,13,33,1,-45,44,
%U -21,10,-11,15,-51,27,-23,32,-13,1,-57,31,-59
%N Numerators of arithmetic derivative of n/2: A003415(n)/2 - n/4; denominators: A010685.
%C For all k>0: a(2*k)=A003415(k) with denominator=A010685(2*k)=1;
%C for primes p>2: a(2*p)=1 with denominator=A010685(2*p)=1,
%C and a(p)=2-p with denominator=A010685(p)=4.
%Y For definition of arithmetic derivative: A003415.
%K sign
%O 1,5
%A _Reinhard Zumkeller_, Mar 19 2002