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A small working example

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A useful disclosure

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A small formula

The sum of the first nn positive integers is n(n+1)/2n(n+1)/2. Math is rendered at build time and styled with local KaTeX resources.

Local code

A simple sum下载完整源码
python
def triangular(n):
    """Return the sum of integers from 1 through n."""
    return n * (n + 1) // 2

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