1＋1/（2*2*2）＋1/（3∧3）＋……＋1/（n∧3）=

是求无穷级数么？貌似欧拉求出来过

Zeta[3]

你求它想干嘛。

zeta(2n)有含pi的表达
zeta(2n+1)没有

http://numbers.computation.free.fr/Constants/Zeta3/zeta3.html

Such formulas does not exist for z(2n+1), and few things are known about these numbers. A breakthrough was made in 1978, when Apery proved that z(3) is irrational (see [1], [2] and [3]). Unhappily, his proof does not extends to other value of z(2n+1). It is not known if z(3) is transcendental or not.

(1/2)*Psi(2, n+1)+Zeta(3)

这不会？

(#怒目环视)
你们这些欺负楼主的坏人的ID我都记好了

为啥这吧里高中水平的帖子这么少！！！要不是2B日经贴就是看不懂的。。。

加完前三项，后面忽略不计就可以了！

ζ（3），1.2几貌似。。