Note: If you’re mathematically astute, you might notice that this example computes triangle numbers. Here’s a quick explanation: http://bbc.in/1O89TGP
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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