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Frontiers | Using Figurate Numbers in Elementary Number Theory – Discussing a 'Useful' Heuristic From the Perspectives of Semiotics and Cognitive Psychology
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Mathigon on Twitter: "Sequences don't always have to be numbers – they can also be geometric shapes. Learn more about triangle, square and other figurate numbers at https://t.co/uBO7Tzszhg https://t.co/0uWzSvHCta" / Twitter
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