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设f(k)是满足不等式log2x+log2(3·2-x)≥2k-1(k∈N+)的自然数x的个数.
(1)求f(k)的解析式;
(2)记Sn=f(1)+f(2)+…+f(n),求Sn的解析式.
(3)令Pn=n2+n-1(n∈N+),试比较Sn与Pn的大小.
设f(k)是满足不等式log2x+log2(3×2k-1-x)≥2k-1(k∈N+)的自然数x的个数.
(2)记Sn=f(1)+f(2)+…+f(n),求Sn的解析式;