一又二又三又四又…

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一又二又三又四又…

一又二又三又四又…Template:按，無窮級數，作 $\sum_{n = 1}^{\infty} n$ 又三角形數，示: $\sum_{n = 1}^{n} n = \frac{n (n + 1)}{2}$ 。以拉馬努金和，示：

1 + 2 + 3 + 4 + \dots = - \frac{1}{12}

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