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之前维基百科的伯努利数求和公式被写复杂了,我竟然一直没有发现......
$\displaystyle\sum_{i=0}^n i^m = \frac{(n+1)^{m+1}}{m+1} + \sum_{i=1}^m\frac{B_i}{m-i+1}{m\choose i}(n+1)^{m-i+1}$
现在改回这样
$\displaystyle\sum_{i=0}^{n} i^m = {1\over{m+1}}\sum_{i=0}^m{m+1\choose{i}} B_i (n+1)^{m+1-i}$ |
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