We can rewrite the summand as log2(1+k1)logk2logk+12=log2klog2(k+1)log2(kk+1)=log2klog2(k+1)log2(k+1)−log2k=log2k1−log2(k+1)1.Therefore, the sum telescopes: k=2∑63log2(1+k1)logk2logk+12=(log221−log231)+(log231−log241)+⋯+(log2631−log2641)=log221−log2641=1−61=65.