Page not found - BBC

Note: If you’re mathematically astute, you might notice that this example computes triangle numbers. Here’s a quick explanation:
the link is not provide anything about like " Sorry, but we’re having difficulties showing you the page you asked for."

I think it was a BBC Bitesize link which has been moved/removed by the BBC.

Here’s a youtube video explaining the concept and also a mathsisfun link

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