..616..~269k(pp+2k)2(x)x.2(x)=#{px:p+2ispri}2(x)2(x)Kxlog2xK(9)3pxf(p)p312pf(p)nPz2(Pzz)=.3pz(p2)=Pz23pz(12p)KK=2p312p(11p)2=2p3[11(p1)2]L()